Update web-platform-tests to revision 0d318188757a9c996e20b82db201fd04de5aa255

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/allowany.widl

@@ -0,0 +1,6 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface B {
+  void g();
+  void g(B b);
+  void g([AllowAny] DOMString s);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/array.widl

@@ -0,0 +1,5 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+[Constructor]
+interface LotteryResults {
+  readonly attribute unsigned short[][] numbers;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/attributes.widl

@@ -0,0 +1,14 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+exception InvalidName {
+  DOMString reason;
+};
+
+exception NoSuchPet { };
+
+interface Person {
+
+  // A simple attribute that can be set to any value the range an unsigned
+  // short can take.
+  attribute unsigned short age;
+
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/callback.widl

@@ -0,0 +1,5 @@
+callback AsyncOperationCallback = void (DOMString status);
+
+callback interface EventHandler {
+  void eventOccurred(DOMString details);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/caller.widl

@@ -0,0 +1,5 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface NumberQuadrupler {
+  // This operation simply returns four times the given number x.
+  legacycaller float compute(float x);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/constants.widl

@@ -0,0 +1,18 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Util {
+  const boolean DEBUG = false;
+  const short negative = -1;
+  const octet LF = 10;
+  const unsigned long BIT_MASK = 0x0000fc00;
+  const float AVOGADRO = 6.022e23;
+  const unrestricted float sobig = Infinity;
+  const unrestricted double minusonedividedbyzero = -Infinity;
+  const short notanumber = NaN;
+};
+
+exception Error {
+  const short ERR_UNKNOWN = 0;
+  const short ERR_OUT_OF_MEMORY = 1;
+
+  short errorCode;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/constructor.widl

@@ -0,0 +1,9 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+[Constructor,
+ Constructor(float radius)]
+interface Circle {
+  attribute float r;
+  attribute float cx;
+  attribute float cy;
+  readonly attribute float circumference;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/dictionary-inherits.widl

@@ -0,0 +1,9 @@
+dictionary PaintOptions {
+  DOMString? fillPattern = "black";
+  DOMString? strokePattern = null;
+  Point position;
+};
+
+dictionary WetPaintOptions : PaintOptions {
+  float hydrometry;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/dictionary.widl

@@ -0,0 +1,11 @@
+// Extracted from Web IDL editors draft May 31 2011
+dictionary PaintOptions {
+  DOMString? fillPattern = "black";
+  DOMString? strokePattern = null;
+  Point position;
+};
+
+partial dictionary A {
+  long h;
+  long d;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/documentation-dos.widl

@@ -0,0 +1,33 @@
+/**
+* \brief Testing documentation features
+*
+* This is a
+* single paragraph
+*
+* <p>This is valid.</p>
+* <p>This is <em>valid</em>.</p>
+* <p>This is <b>valid</b>.</p>
+* <p>This is <a href=''>valid</a>.</p>
+* <ul>
+* <li>This</li>
+* <li>is</li>
+* <li>valid</li>
+* </ul>
+* <dl>
+* <dt>This</dt>
+* <dd>valid</dd>
+* </dl>
+* <table>
+* <tr>
+* <td>this</td>
+* <td>is</td>
+* </tr>
+* <tr>
+* <td>valid</td>
+* </tr>
+* </table>
+* <p>This is <br> valid.</p>
+* <p>This is <br /> valid.</p>
+* <p>This is <br/> valid.</p>
+*/
+interface Documentation {};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/documentation.widl

@@ -0,0 +1,34 @@
+/**
+* \brief Testing documentation features
+*
+* This is a
+* single paragraph
+*
+* <p>This is valid.</p>
+* <p>This is <em>valid</em>.</p>
+* <p>This is <b>valid</b>.</p>
+* <p>This is <a href=''>valid</a>.</p>
+* <ul>
+* <li>This</li>
+* <li>is</li>
+* <li>valid</li>
+* </ul>
+* <dl>
+* <dt>This</dt>
+* <dd>valid</dd>
+* </dl>
+* <table>
+* <tr>
+* <td>this</td>
+* <td>is</td>
+* </tr>
+* <tr>
+* <td>valid</td>
+* </tr>
+* </table>
+* <p>This is <br> valid.</p>
+* <p>This is <br /> valid.</p>
+* <p>This is <br/> valid.</p>
+* <p><img src="foo.png" alt="Valid"/></p>
+*/
+interface Documentation {};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/enum.widl

@@ -0,0 +1,8 @@
+enum MealType { "rice", "noodles", "other" };
+
+interface Meal {
+  attribute MealType type;
+  attribute float size;     // in grams
+
+  void initialize(MealType type, float size);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/equivalent-decl.widl

@@ -0,0 +1,18 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Dictionary {
+  readonly attribute unsigned long propertyCount;
+
+  getter float getProperty(DOMString propertyName);
+  setter void setProperty(DOMString propertyName, float propertyValue);
+};
+
+
+interface Dictionary {
+  readonly attribute unsigned long propertyCount;
+
+  float getProperty(DOMString propertyName);
+  void setProperty(DOMString propertyName, float propertyValue);
+
+  getter float (DOMString propertyName);
+  setter void (DOMString propertyName, float propertyValue);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/exception-inheritance.widl

@@ -0,0 +1,7 @@
+// from http://lists.w3.org/Archives/Public/public-script-coord/2010OctDec/0112.html
+  exception DOMException {
+    unsigned short code;
+  };
+
+  exception HierarchyRequestError : DOMException { };
+  exception NoModificationAllowedError : DOMException { };

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/exception.widl

@@ -0,0 +1,8 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Dahut {
+  attribute DOMString type;
+};
+
+exception SomeException {
+};
+

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/generic.widl

@@ -0,0 +1,17 @@
+interface Foo {
+  Promise<ResponsePromise<sequence<DOMString?>>> bar();
+};
+
+// Extracted from https://slightlyoff.github.io/ServiceWorker/spec/service_worker/ on 2014-05-08
+
+interface ServiceWorkerClients {
+  Promise<Client[]?> getServiced();
+  Promise<any> reloadAll();
+};
+
+// Extracted from https://slightlyoff.github.io/ServiceWorker/spec/service_worker/ on 2014-05-13
+
+interface FetchEvent : Event {
+  ResponsePromise<any> default();
+};
+

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/getter-setter.widl

@@ -0,0 +1,7 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Dictionary {
+  readonly attribute unsigned long propertyCount;
+
+  getter float (DOMString propertyName);
+  setter void (DOMString propertyName, float propertyValue);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/identifier-qualified-names.widl

@@ -0,0 +1,44 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+  // Typedef identifier: "number"
+  // Qualified name:    "::framework::number"
+  typedef float number;
+
+  // Exception identifier: "FrameworkException"
+  // Qualified name:       "::framework::FrameworkException"
+  exception FrameworkException {
+
+    // Constant identifier: "ERR_NOT_FOUND"
+    // Qualified name:      "::framework::FrameworkException::ERR_NOT_FOUND"
+    const long ERR_NOT_FOUND = 1;
+
+    // Exception field identifier: "code"
+    long code;
+  };
+
+  // Interface identifier: "System"
+  // Qualified name:       "::framework::System"
+  interface System {
+
+    // Operation identifier:          "createObject"
+    // Operation argument identifier: "interface"
+    object createObject(DOMString _interface);
+
+    // Operation has no identifier; it declares a getter.
+    getter DOMString (DOMString keyName);
+  };
+
+    
+    // Interface identifier: "TextField"
+    // Qualified name:       "::framework::gui::TextField"
+    interface TextField {
+
+      // Attribute identifier: "const"
+      attribute boolean _const;
+
+      // Attribute identifier: "value"
+      attribute DOMString? _value;
+    };
+
+interface Foo {
+ void op(object interface);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/implements.widl

@@ -0,0 +1,14 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+  interface Node {
+    readonly attribute unsigned short nodeType;
+    // ...
+  };
+
+  interface EventTarget {
+    void addEventListener(DOMString type,
+                          EventListener listener,
+                          boolean useCapture);
+    // ...
+  };
+
+  Node implements EventTarget;

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/indexed-properties.widl

@@ -0,0 +1,12 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface OrderedMap {
+  readonly attribute unsigned long size;
+
+  getter any getByIndex(unsigned long index);
+  setter void setByIndex(unsigned long index, any value);
+  deleter void removeByIndex(unsigned long index);
+
+  getter any get(DOMString name);
+  setter creator void set(DOMString name, any value);
+  deleter void remove(DOMString name);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/inherits-getter.widl

@@ -0,0 +1,16 @@
+interface Animal {
+
+  // A simple attribute that can be set to any string value.
+  readonly attribute DOMString name;
+};
+
+interface Person : Animal {
+
+  // An attribute whose value cannot be assigned to.
+  readonly attribute unsigned short age;
+
+  // An attribute that can raise an exception if it is set to an invalid value.
+  // Its getter behavior is inherited from Animal, and need not be specified
+  // the description of Person.
+  inherit attribute DOMString name;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/interface-inherits.widl

@@ -0,0 +1,12 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Animal {
+  attribute DOMString name;
+};
+
+interface Human : Animal {
+  attribute Dog pet;
+};
+
+interface Dog : Animal {
+  attribute Human owner;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/iterator.widl

@@ -0,0 +1,35 @@
+interface SessionManager {
+  Session getSessionForUser(DOMString username);
+  readonly attribute unsigned long sessionCount;
+
+  Session iterator;
+};
+
+interface Session {
+  readonly attribute DOMString username;
+  // ...
+};
+
+interface SessionManager2 {
+  Session2 getSessionForUser(DOMString username);
+  readonly attribute unsigned long sessionCount;
+
+  Session2 iterator = SessionIterator;
+};
+
+interface Session2 {
+  readonly attribute DOMString username;
+  // ...
+};
+
+interface SessionIterator {
+  readonly attribute unsigned long remainingSessions;
+};
+
+     interface NodeList {
+       Node iterator = NodeIterator;
+     };
+
+     interface NodeIterator {
+       Node iterator object;
+     };

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/map.widl

@@ -0,0 +1,5 @@
+// Extracted from https://slightlyoff.github.io/ServiceWorker/spec/service_worker/ on 2014-05-06
+
+[MapClass(DOMString, DOMString)]
+interface HeaderMap {
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/namedconstructor.widl

@@ -0,0 +1,6 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+[NamedConstructor=Audio,
+ NamedConstructor=Audio(DOMString src)]
+interface HTMLAudioElement : HTMLMediaElement {
+  // ...
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/nointerfaceobject.widl

@@ -0,0 +1,5 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+[NoInterfaceObject]
+interface Query {
+  any lookupEntry(unsigned long key);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/nullable.widl

@@ -0,0 +1,9 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface MyConstants {
+  const boolean? ARE_WE_THERE_YET = false;
+};
+
+interface Node {
+  readonly attribute DOMString? namespaceURI;
+  // ...
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/nullableobjects.widl

@@ -0,0 +1,13 @@
+// Extracted from WebIDL spec 2011-05-23
+
+interface A {
+  // ...
+};
+interface B {
+  // ...
+};
+interface C {
+  void f(A? x);
+  void f(B? x);
+
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/operation-optional-arg.widl

@@ -0,0 +1,4 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface ColorCreator {
+  object createColor(float v1, float v2, float v3, optional float alpha = 3.5);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/overloading.widl

@@ -0,0 +1,20 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface A {
+  // ...
+};
+
+interface B {
+  // ...
+};
+
+interface C {
+  void f(A x);
+  void f(B x);
+};
+
+interface A {
+  /* f1 */ void f(DOMString a);
+  /* f2 */ void f([AllowAny] DOMString a, DOMString b, float... c);
+  /* f3 */ void f();
+  /* f4 */ void f(long a, DOMString b, optional DOMString c, float... d);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/overridebuiltins.widl

@@ -0,0 +1,6 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+[OverrideBuiltins]
+interface StringMap2 {
+  readonly attribute unsigned long length;
+  getter DOMString lookup(DOMString key);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/partial-interface.widl

@@ -0,0 +1,7 @@
+interface Foo {
+  attribute DOMString bar;
+};
+
+partial interface Foo {
+  attribute DOMString quux;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/primitives.widl

@@ -0,0 +1,19 @@
+interface Primitives {
+  attribute boolean truth;
+  attribute byte character;
+  attribute octet value;
+  attribute short number;
+  attribute unsigned short positive;
+  attribute long big;
+  attribute unsigned long bigpositive;
+  attribute long long bigbig;
+  attribute  unsigned long long bigbigpositive;
+  attribute float real;
+  attribute double bigreal; 
+  attribute unrestricted float realwithinfinity;
+  attribute unrestricted double bigrealwithinfinity; 
+  attribute DOMString string; 
+  attribute ByteString bytes; 
+  attribute Date date;
+  attribute RegExp regexp;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/prototyperoot.widl

@@ -0,0 +1,5 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+[PrototypeRoot]
+interface Node {
+  readonly attribute unsigned short nodeType;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/putforwards.widl

@@ -0,0 +1,5 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Person {
+  [PutForwards=full] readonly attribute Name name;
+  attribute unsigned short age;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/reg-operations.widl

@@ -0,0 +1,17 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Dimensions {
+  attribute unsigned long width;
+  attribute unsigned long height;
+};
+
+exception NoPointerDevice { };
+
+interface Button {
+
+  // An operation that takes no arguments, returns a boolean
+  boolean isMouseOver();
+
+  // Overloaded operations.
+  void setDimensions(Dimensions size);
+  void setDimensions(unsigned long width, unsigned long height);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/replaceable.widl

@@ -0,0 +1,5 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Counter {
+  [Replaceable] readonly attribute unsigned long value;
+  void increment();
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/sequence.widl

@@ -0,0 +1,12 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+// edited to remove sequence as attributes, now invalid
+interface Canvas {
+  void drawPolygon(sequence<float> coordinates);
+  sequence<float> getInflectionPoints();
+  // ...
+};
+
+// Make sure sequence can still be registered as a type.
+interface Foo {
+  sequence bar();
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/serializer.widl

@@ -0,0 +1,64 @@
+interface Transaction {
+  readonly attribute Account from;
+  readonly attribute Account to;
+  readonly attribute float amount;
+  readonly attribute DOMString description;
+  readonly attribute unsigned long number;
+
+  serializer;
+};
+
+interface Account {
+  attribute DOMString name;
+  attribute unsigned long number;
+  serializer DOMString serialize();
+};
+
+interface Transaction2 {
+  readonly attribute Account2 from;
+  readonly attribute Account2 to;
+  readonly attribute float amount;
+  readonly attribute DOMString description;
+  readonly attribute unsigned long number;
+
+  serializer = { from, to, amount, description };
+};
+
+interface Account2 {
+  attribute DOMString name;
+  attribute unsigned long number;
+  serializer = number;
+};
+
+interface Account3 {
+  attribute DOMString name;
+  attribute unsigned long number;
+
+  serializer = { attribute };
+};
+
+interface Account4 {
+  getter object getItem(unsigned long index);
+  serializer = { getter };
+};
+
+interface Account5 : Account {
+  attribute DOMString secondname;
+  serializer = { inherit, secondname };
+};
+
+interface Account6 : Account {
+  attribute DOMString secondname;
+  serializer = { inherit, attribute };
+};
+
+interface Account7 {
+  attribute DOMString name;
+  attribute unsigned long number;
+  serializer = [ name, number ];
+};
+
+interface Account8 {
+  getter object getItem(unsigned long index);
+  serializer = [ getter ];
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/static.widl

@@ -0,0 +1,11 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Point { /* ... */ };
+
+interface Circle {
+  attribute float cx;
+  attribute float cy;
+  attribute float radius;
+
+  static readonly attribute long triangulationCount;
+  static Point triangulate(Circle c1, Circle c2, Circle c3);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/stringifier-attribute.widl

@@ -0,0 +1,6 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+[Constructor]
+interface Student {
+  attribute unsigned long id;
+  stringifier attribute DOMString name;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/stringifier-custom.widl

@@ -0,0 +1,9 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+[Constructor]
+interface Student {
+  attribute unsigned long id;
+  attribute DOMString? familyName;
+  attribute DOMString givenName;
+
+  stringifier DOMString ();
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/stringifier.widl

@@ -0,0 +1,8 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface A {
+  stringifier DOMString ();
+};
+
+interface A {
+  stringifier;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/treatasnull.widl

@@ -0,0 +1,7 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Dog {
+  attribute DOMString name;
+  attribute DOMString owner;
+
+  boolean isMemberOfBreed([TreatNullAs=EmptyString] DOMString breedName);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/treatasundefined.widl

@@ -0,0 +1,7 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface Cat {
+  attribute DOMString name;
+  attribute DOMString owner;
+
+  boolean isMemberOfBreed([TreatUndefinedAs=EmptyString] DOMString breedName);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/typedef.widl

@@ -0,0 +1,22 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+      interface Point {
+        attribute float x;
+        attribute float y;
+      };
+
+      typedef sequence<Point> PointSequence;
+
+      interface Rect {
+        attribute Point topleft;
+        attribute Point bottomright;
+      };
+
+  interface Widget {
+
+    readonly attribute Rect bounds;
+
+    boolean pointWithinBounds(Point p);
+    boolean allPointsWithinBounds(PointSequence ps);
+  };
+
+  typedef [Clamp] octet value;

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/typesuffixes.widl

@@ -0,0 +1,3 @@
+interface Suffixes {
+  void test(sequence<DOMString[]?>? foo);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/uniontype.widl

@@ -0,0 +1,3 @@
+interface Union {
+ attribute (float or (Date or Event) or (Node or DOMString)?) test;
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/idl/variadic-operations.widl

@@ -0,0 +1,7 @@
+// Extracted from http://dev.w3.org/2006/webapi/WebIDL/ on 2011-05-06
+interface IntegerSet {
+  readonly attribute unsigned long cardinality;
+
+  void union(long... ints);
+  void intersection(long... ints);
+};

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/allowany.json

@@ -0,0 +1,109 @@
+[
+    {
+        "type": "interface",
+        "name": "B",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "g",
+                "arguments": [],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "g",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "B"
+                        },
+                        "name": "b"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "g",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [
+                            {
+                                "name": "AllowAny",
+                                "arguments": null
+                            }
+                        ],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "s"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/array.json

@@ -0,0 +1,34 @@
+[
+    {
+        "type": "interface",
+        "name": "LotteryResults",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": 2,
+                    "nullableArray": [false, false],
+                    "union": false,
+                    "idlType": "unsigned short"
+                },
+                "name": "numbers",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": [
+            {
+                "name": "Constructor",
+                "arguments": null
+            }
+        ]
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/attributes.json

@@ -0,0 +1,56 @@
+[
+    {
+        "type": "exception",
+        "name": "InvalidName",
+        "members": [
+            {
+                "type": "field",
+                "name": "reason",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "exception",
+        "name": "NoSuchPet",
+        "members": [],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Person",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned short"
+                },
+                "name": "age",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/callback.json

@@ -0,0 +1,76 @@
+[
+    {
+        "type": "callback",
+        "name": "AsyncOperationCallback",
+        "idlType": {
+            "sequence": false,
+            "generic": null,
+            "nullable": false,
+            "array": false,
+            "union": false,
+            "idlType": "void"
+        },
+        "arguments": [
+            {
+                "optional": false,
+                "variadic": false,
+                "extAttrs": [],
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "status"
+            }
+        ],
+        "extAttrs": []
+    },
+    {
+        "type": "callback interface",
+        "name": "EventHandler",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "eventOccurred",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "details"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/caller.json

@@ -0,0 +1,47 @@
+[
+    {
+        "type": "interface",
+        "name": "NumberQuadrupler",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": true,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "compute",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "x"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/constants.json

@@ -0,0 +1,141 @@
+[
+    {
+        "type": "interface",
+        "name": "Util",
+        "partial": false,
+        "members": [
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "boolean",
+                "name": "DEBUG",
+                "value": {
+                    "type": "boolean",
+                    "value": false
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "short",
+                "name": "negative",
+                "value": {
+                    "type": "number",
+                    "value": -1
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "octet",
+                "name": "LF",
+                "value": {
+                    "type": "number",
+                    "value": 10
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "unsigned long",
+                "name": "BIT_MASK",
+                "value": {
+                    "type": "number",
+                    "value": 64512
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "float",
+                "name": "AVOGADRO",
+                "value": {
+                    "type": "number",
+                    "value": 6.022e+23
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "unrestricted float",
+                "name": "sobig",
+                "value": {
+                    "type": "Infinity",
+                    "negative": false
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "unrestricted double",
+                "name": "minusonedividedbyzero",
+                "value": {
+                    "type": "Infinity",
+                    "negative": true
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "short",
+                "name": "notanumber",
+                "value": {
+                    "type": "NaN"
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "exception",
+        "name": "Error",
+        "members": [
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "short",
+                "name": "ERR_UNKNOWN",
+                "value": {
+                    "type": "number",
+                    "value": 0
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "short",
+                "name": "ERR_OUT_OF_MEMORY",
+                "value": {
+                    "type": "number",
+                    "value": 1
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "field",
+                "name": "errorCode",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "short"
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/constructor.json

@@ -0,0 +1,103 @@
+[
+    {
+        "type": "interface",
+        "name": "Circle",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "r",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "cx",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "cy",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "circumference",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": [
+            {
+                "name": "Constructor",
+                "arguments": null
+            },
+            {
+                "name": "Constructor",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "radius"
+                    }
+                ]
+            }
+        ]
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/dictionary-inherits.json

@@ -0,0 +1,79 @@
+[
+    {
+        "type": "dictionary",
+        "name": "PaintOptions",
+        "partial": false,
+        "members": [
+            {
+                "type": "field",
+                "name": "fillPattern",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": true,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "extAttrs": [],
+                "default": {
+                    "type": "string",
+                    "value": "black"
+                }
+            },
+            {
+                "type": "field",
+                "name": "strokePattern",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": true,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "extAttrs": [],
+                "default": {
+                    "type": "null"
+                }
+            },
+            {
+                "type": "field",
+                "name": "position",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Point"
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "dictionary",
+        "name": "WetPaintOptions",
+        "partial": false,
+        "members": [
+            {
+                "type": "field",
+                "name": "hydrometry",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": "PaintOptions",
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/dictionary.json

@@ -0,0 +1,91 @@
+[
+    {
+        "type": "dictionary",
+        "name": "PaintOptions",
+        "partial": false,
+        "members": [
+            {
+                "type": "field",
+                "name": "fillPattern",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": true,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "extAttrs": [],
+                "default": {
+                    "type": "string",
+                    "value": "black"
+                }
+            },
+            {
+                "type": "field",
+                "name": "strokePattern",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": true,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "extAttrs": [],
+                "default": {
+                    "type": "null"
+                }
+            },
+            {
+                "type": "field",
+                "name": "position",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Point"
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "dictionary",
+        "name": "A",
+        "partial": true,
+        "members": [
+            {
+                "type": "field",
+                "name": "h",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "long"
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "field",
+                "name": "d",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "long"
+                },
+                "extAttrs": []
+            }
+        ],
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/documentation-dos.json

@@ -0,0 +1,10 @@
+[
+    {
+        "type": "interface",
+        "name": "Documentation",
+        "partial": false,
+        "members": [],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/documentation.json

@@ -0,0 +1,10 @@
+[
+    {
+        "type": "interface",
+        "name": "Documentation",
+        "partial": false,
+        "members": [],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/enum.json

@@ -0,0 +1,105 @@
+[
+    {
+        "type": "enum",
+        "name": "MealType",
+        "values": [
+            "rice",
+            "noodles",
+            "other"
+        ],
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Meal",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "MealType"
+                },
+                "name": "type",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "size",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "initialize",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "MealType"
+                        },
+                        "name": "type"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "size"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/equivalent-decl.json

@@ -0,0 +1,312 @@
+[
+    {
+        "type": "interface",
+        "name": "Dictionary",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "propertyCount",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": true,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "getProperty",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "propertyName"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": true,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "setProperty",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "propertyName"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "propertyValue"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Dictionary",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "propertyCount",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "getProperty",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "propertyName"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "setProperty",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "propertyName"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "propertyValue"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": true,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": null,
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "propertyName"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": true,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": null,
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "propertyName"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "propertyValue"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/exception-inheritance.json

@@ -0,0 +1,37 @@
+[
+    {
+        "type": "exception",
+        "name": "DOMException",
+        "members": [
+            {
+                "type": "field",
+                "name": "code",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned short"
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "exception",
+        "name": "HierarchyRequestError",
+        "members": [],
+        "inheritance": "DOMException",
+        "extAttrs": []
+    },
+    {
+        "type": "exception",
+        "name": "NoModificationAllowedError",
+        "members": [],
+        "inheritance": "DOMException",
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/exception.json

@@ -0,0 +1,35 @@
+[
+    {
+        "type": "interface",
+        "name": "Dahut",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "type",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "exception",
+        "name": "SomeException",
+        "members": [],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/generic.json

@@ -0,0 +1,156 @@
+[
+    {
+        "type": "interface",
+        "name": "Foo",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": "Promise",
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": {
+                        "sequence": false,
+                        "generic": "ResponsePromise",
+                        "nullable": false,
+                        "array": false,
+                        "union": false,
+                        "idlType": {
+                            "sequence": true,
+                            "generic": "sequence",
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": {
+                                "sequence": false,
+                                "generic": null,
+                                "nullable": true,
+                                "array": false,
+                                "union": false,
+                                "idlType": "DOMString"
+                            }
+                        }
+                    }
+                },
+                "name": "bar",
+                "arguments": [],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "ServiceWorkerClients",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": "Promise",
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": {
+                        "sequence": false,
+                        "generic": null,
+                        "nullable": true,
+                        "nullableArray": [false],
+                        "array": 1,
+                        "union": false,
+                        "idlType": "Client"
+                    }
+                },
+                "name": "getServiced",
+                "arguments": [],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": "Promise",
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": {
+                        "sequence": false,
+                        "generic": null,
+                        "nullable": false,
+                        "array": false,
+                        "union": false,
+                        "idlType": "any"
+                    }
+                },
+                "name": "reloadAll",
+                "arguments": [],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "FetchEvent",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": "ResponsePromise",
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": {
+                        "sequence": false,
+                        "generic": null,
+                        "nullable": false,
+                        "array": false,
+                        "union": false,
+                        "idlType": "any"
+                    }
+                },
+                "name": "default",
+                "arguments": [],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": "Event",
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/getter-setter.json

@@ -0,0 +1,114 @@
+[
+    {
+        "type": "interface",
+        "name": "Dictionary",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "propertyCount",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": true,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": null,
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "propertyName"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": true,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": null,
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "propertyName"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "propertyValue"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/identifier-qualified-names.json

@@ -0,0 +1,217 @@
+[
+    {
+        "type": "typedef",
+        "typeExtAttrs": [],
+        "idlType": {
+            "sequence": false,
+            "generic": null,
+            "nullable": false,
+            "array": false,
+            "union": false,
+            "idlType": "float"
+        },
+        "name": "number",
+        "extAttrs": []
+    },
+    {
+        "type": "exception",
+        "name": "FrameworkException",
+        "members": [
+            {
+                "type": "const",
+                "nullable": false,
+                "idlType": "long",
+                "name": "ERR_NOT_FOUND",
+                "value": {
+                    "type": "number",
+                    "value": 1
+                },
+                "extAttrs": []
+            },
+            {
+                "type": "field",
+                "name": "code",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "long"
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "System",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "object"
+                },
+                "name": "createObject",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "interface"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": true,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": null,
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "keyName"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "TextField",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "boolean"
+                },
+                "name": "const",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": true,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "value",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Foo",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "op",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "object"
+                        },
+                        "name": "interface"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/implements.json

@@ -0,0 +1,107 @@
+[
+    {
+        "type": "interface",
+        "name": "Node",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned short"
+                },
+                "name": "nodeType",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "EventTarget",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "addEventListener",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "type"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "EventListener"
+                        },
+                        "name": "listener"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "boolean"
+                        },
+                        "name": "useCapture"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "implements",
+        "target": "Node",
+        "implements": "EventTarget",
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/indexed-properties.json

@@ -0,0 +1,272 @@
+[
+    {
+        "type": "interface",
+        "name": "OrderedMap",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "size",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": true,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "any"
+                },
+                "name": "getByIndex",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "unsigned long"
+                        },
+                        "name": "index"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": true,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "setByIndex",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "unsigned long"
+                        },
+                        "name": "index"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "any"
+                        },
+                        "name": "value"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": true,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "removeByIndex",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "unsigned long"
+                        },
+                        "name": "index"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": true,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "any"
+                },
+                "name": "get",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "name"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": true,
+                "creator": true,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "set",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "name"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "any"
+                        },
+                        "name": "value"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": true,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "remove",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "name"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/inherits-getter.json

@@ -0,0 +1,71 @@
+[
+    {
+        "type": "interface",
+        "name": "Animal",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "name",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Person",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned short"
+                },
+                "name": "age",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": true,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "name",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": "Animal",
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/interface-inherits.json

@@ -0,0 +1,80 @@
+[
+    {
+        "type": "interface",
+        "name": "Animal",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "name",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Human",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Dog"
+                },
+                "name": "pet",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": "Animal",
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Dog",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Human"
+                },
+                "name": "owner",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": "Animal",
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/iterator.json

@@ -0,0 +1,301 @@
+[
+    {
+        "type": "interface",
+        "name": "SessionManager",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Session"
+                },
+                "name": "getSessionForUser",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "username"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "sessionCount",
+                "extAttrs": []
+            },
+            {
+                "type": "iterator",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Session"
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Session",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "username",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "SessionManager2",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Session2"
+                },
+                "name": "getSessionForUser",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "username"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "sessionCount",
+                "extAttrs": []
+            },
+            {
+                "type": "iterator",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Session2"
+                },
+                "iteratorObject": "SessionIterator",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Session2",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "username",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "SessionIterator",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "remainingSessions",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "NodeList",
+        "partial": false,
+        "members": [
+            {
+                "type": "iterator",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Node"
+                },
+                "iteratorObject": "NodeIterator",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "NodeIterator",
+        "partial": false,
+        "members": [
+            {
+                "type": "iterator",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Node"
+                },
+                "iteratorObject": "object",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/map.json

@@ -0,0 +1,29 @@
+[
+    {
+        "type": "interface",
+        "name": "HeaderMap",
+        "partial": false,
+        "members": [],
+        "inheritance": null,
+        "extAttrs": [{
+            "name": "MapClass",
+            "arguments": null,
+            "typePair": [{
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+            }]
+        }]
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/namedconstructor.json

@@ -0,0 +1,42 @@
+[
+    {
+        "type": "interface",
+        "name": "HTMLAudioElement",
+        "partial": false,
+        "members": [],
+        "inheritance": "HTMLMediaElement",
+        "extAttrs": [
+            {
+                "name": "NamedConstructor",
+                "arguments": null,
+                "rhs": {
+                    "type": "identifier",
+                    "value": "Audio"
+                }
+            },
+            {
+                "name": "NamedConstructor",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "src"
+                    }
+                ],
+                "rhs": {
+                    "type": "identifier",
+                    "value": "Audio"
+                }
+            }
+        ]
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/nointerfaceobject.json

@@ -0,0 +1,52 @@
+[
+    {
+        "type": "interface",
+        "name": "Query",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "any"
+                },
+                "name": "lookupEntry",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "unsigned long"
+                        },
+                        "name": "key"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": [
+            {
+                "name": "NoInterfaceObject",
+                "arguments": null
+            }
+        ]
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/nullable.json

@@ -0,0 +1,48 @@
+[
+    {
+        "type": "interface",
+        "name": "MyConstants",
+        "partial": false,
+        "members": [
+            {
+                "type": "const",
+                "nullable": true,
+                "idlType": "boolean",
+                "name": "ARE_WE_THERE_YET",
+                "value": {
+                    "type": "boolean",
+                    "value": false
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Node",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": true,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "namespaceURI",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/nullableobjects.json

@@ -0,0 +1,99 @@
+[
+    {
+        "type": "interface",
+        "name": "A",
+        "partial": false,
+        "members": [],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "B",
+        "partial": false,
+        "members": [],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "C",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "f",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": true,
+                            "array": false,
+                            "union": false,
+                            "idlType": "A"
+                        },
+                        "name": "x"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "f",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": true,
+                            "array": false,
+                            "union": false,
+                            "idlType": "B"
+                        },
+                        "name": "x"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/operation-optional-arg.json

@@ -0,0 +1,93 @@
+[
+    {
+        "type": "interface",
+        "name": "ColorCreator",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "object"
+                },
+                "name": "createColor",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "v1"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "v2"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "v3"
+                    },
+                    {
+                        "optional": true,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "alpha",
+                        "default": {
+                            "type": "number",
+                            "value": 3.5
+                        }
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/overloading.json

@@ -0,0 +1,312 @@
+[
+    {
+        "type": "interface",
+        "name": "A",
+        "partial": false,
+        "members": [],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "B",
+        "partial": false,
+        "members": [],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "C",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "f",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "A"
+                        },
+                        "name": "x"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "f",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "B"
+                        },
+                        "name": "x"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "A",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "f",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "a"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "f",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [
+                            {
+                                "name": "AllowAny",
+                                "arguments": null
+                            }
+                        ],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "a"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "b"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": true,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "c"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "f",
+                "arguments": [],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "f",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "long"
+                        },
+                        "name": "a"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "b"
+                    },
+                    {
+                        "optional": true,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "c"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": true,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        "name": "d"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/overridebuiltins.json

@@ -0,0 +1,69 @@
+[
+    {
+        "type": "interface",
+        "name": "StringMap2",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "length",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": true,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "lookup",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "key"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": [
+            {
+                "name": "OverrideBuiltins",
+                "arguments": null
+            }
+        ]
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/partial-interface.json

@@ -0,0 +1,53 @@
+[
+    {
+        "type": "interface",
+        "name": "Foo",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "bar",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Foo",
+        "partial": true,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "quux",
+                "extAttrs": []
+            }
+        ],
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/primitives.json

@@ -0,0 +1,300 @@
+[
+    {
+        "type": "interface",
+        "name": "Primitives",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "boolean"
+                },
+                "name": "truth",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "byte"
+                },
+                "name": "character",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "octet"
+                },
+                "name": "value",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "short"
+                },
+                "name": "number",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned short"
+                },
+                "name": "positive",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "long"
+                },
+                "name": "big",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "bigpositive",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "long long"
+                },
+                "name": "bigbig",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long long"
+                },
+                "name": "bigbigpositive",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "real",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "double"
+                },
+                "name": "bigreal",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unrestricted float"
+                },
+                "name": "realwithinfinity",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unrestricted double"
+                },
+                "name": "bigrealwithinfinity",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "string",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "ByteString"
+                },
+                "name": "bytes",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Date"
+                },
+                "name": "date",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "RegExp"
+                },
+                "name": "regexp",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/prototyperoot.json

@@ -0,0 +1,33 @@
+[
+    {
+        "type": "interface",
+        "name": "Node",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned short"
+                },
+                "name": "nodeType",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": [
+            {
+                "name": "PrototypeRoot",
+                "arguments": null
+            }
+        ]
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/putforwards.json

@@ -0,0 +1,54 @@
+[
+    {
+        "type": "interface",
+        "name": "Person",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Name"
+                },
+                "name": "name",
+                "extAttrs": [
+                    {
+                        "name": "PutForwards",
+                        "arguments": null,
+                        "rhs": {
+                            "type": "identifier",
+                            "value": "full"
+                        }
+                    }
+                ]
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned short"
+                },
+                "name": "age",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/reg-operations.json

@@ -0,0 +1,168 @@
+[
+    {
+        "type": "interface",
+        "name": "Dimensions",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "width",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "height",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "exception",
+        "name": "NoPointerDevice",
+        "members": [],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Button",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "boolean"
+                },
+                "name": "isMouseOver",
+                "arguments": [],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "setDimensions",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "Dimensions"
+                        },
+                        "name": "size"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "setDimensions",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "unsigned long"
+                        },
+                        "name": "width"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "unsigned long"
+                        },
+                        "name": "height"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/replaceable.json

@@ -0,0 +1,54 @@
+[
+    {
+        "type": "interface",
+        "name": "Counter",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "value",
+                "extAttrs": [
+                    {
+                        "name": "Replaceable",
+                        "arguments": null
+                    }
+                ]
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "increment",
+                "arguments": [],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/sequence.json

@@ -0,0 +1,113 @@
+[
+    {
+        "type": "interface",
+        "name": "Canvas",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "drawPolygon",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": true,
+                            "generic": "sequence",
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": {
+                                "sequence": false,
+                                "generic": null,
+                                "nullable": false,
+                                "array": false,
+                                "union": false,
+                                "idlType": "float"
+                            }
+                        },
+                        "name": "coordinates"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": true,
+                    "generic": "sequence",
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": {
+                        "sequence": false,
+                        "generic": null,
+                        "nullable": false,
+                        "array": false,
+                        "union": false,
+                        "idlType": "float"
+                    }
+                },
+                "name": "getInflectionPoints",
+                "arguments": [],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Foo",
+        "partial": false,
+        "members": [
+
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "sequence"
+                },
+                "name": "bar",
+                "arguments": [],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }    
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/serializer.json

@@ -0,0 +1,591 @@
+[
+    {
+        "type": "interface",
+        "name": "Transaction",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Account"
+                },
+                "name": "from",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Account"
+                },
+                "name": "to",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "amount",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "description",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "number",
+                "extAttrs": []
+            },
+            {
+                "type": "serializer",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Account",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "name",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "number",
+                "extAttrs": []
+            },
+            {
+                "type": "serializer",
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "operation": {
+                    "name": "serialize",
+                    "arguments": []
+                },
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Transaction2",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Account2"
+                },
+                "name": "from",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Account2"
+                },
+                "name": "to",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "amount",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "description",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "number",
+                "extAttrs": []
+            },
+            {
+                "type": "serializer",
+                "patternMap": true,
+                "names": [
+                    "from",
+                    "to",
+                    "amount",
+                    "description"
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Account2",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "name",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "number",
+                "extAttrs": []
+            },
+            {
+                "type": "serializer",
+                "name": "number",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Account3",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "name",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "number",
+                "extAttrs": []
+            },
+            {
+                "type": "serializer",
+                "patternMap": true,
+                "names": [
+                    "attribute"
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Account4",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": true,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "object"
+                },
+                "name": "getItem",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "unsigned long"
+                        },
+                        "name": "index"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "serializer",
+                "patternMap": true,
+                "names": [
+                    "getter"
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Account5",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "secondname",
+                "extAttrs": []
+            },
+            {
+                "type": "serializer",
+                "patternMap": true,
+                "names": [
+                    "inherit",
+                    "secondname"
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": "Account",
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Account6",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "secondname",
+                "extAttrs": []
+            },
+            {
+                "type": "serializer",
+                "patternMap": true,
+                "names": [
+                    "inherit",
+                    "attribute"
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": "Account",
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Account7",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "name",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "number",
+                "extAttrs": []
+            },
+            {
+                "type": "serializer",
+                "patternList": true,
+                "names": [
+                    "name",
+                    "number"
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Account8",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": true,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "object"
+                },
+                "name": "getItem",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "unsigned long"
+                        },
+                        "name": "index"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "serializer",
+                "patternList": true,
+                "names": [
+                    "getter"
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/static.json

@@ -0,0 +1,151 @@
+[
+    {
+        "type": "interface",
+        "name": "Point",
+        "partial": false,
+        "members": [],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Circle",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "cx",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "cy",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "radius",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": true,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "long"
+                },
+                "name": "triangulationCount",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": true,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Point"
+                },
+                "name": "triangulate",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "Circle"
+                        },
+                        "name": "c1"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "Circle"
+                        },
+                        "name": "c2"
+                    },
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "Circle"
+                        },
+                        "name": "c3"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/stringifier-attribute.json

@@ -0,0 +1,50 @@
+[
+    {
+        "type": "interface",
+        "name": "Student",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "id",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": true,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "name",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": [
+            {
+                "name": "Constructor",
+                "arguments": null
+            }
+        ]
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/stringifier-custom.json

@@ -0,0 +1,88 @@
+[
+    {
+        "type": "interface",
+        "name": "Student",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "id",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": true,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "familyName",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "givenName",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": null,
+                "arguments": [],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": [
+            {
+                "name": "Constructor",
+                "arguments": null
+            }
+        ]
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/stringifier.json

@@ -0,0 +1,52 @@
+[
+    {
+        "type": "interface",
+        "name": "A",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": null,
+                "arguments": [],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "A",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": true,
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/treatasnull.json

@@ -0,0 +1,90 @@
+[
+    {
+        "type": "interface",
+        "name": "Dog",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "name",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "owner",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "boolean"
+                },
+                "name": "isMemberOfBreed",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [
+                            {
+                                "name": "TreatNullAs",
+                                "arguments": null,
+                                "rhs": {
+                                    "type": "identifier",
+                                    "value": "EmptyString"
+                                }
+                            }
+                        ],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "breedName"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/treatasundefined.json

@@ -0,0 +1,90 @@
+[
+    {
+        "type": "interface",
+        "name": "Cat",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "name",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "DOMString"
+                },
+                "name": "owner",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "boolean"
+                },
+                "name": "isMemberOfBreed",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [
+                            {
+                                "name": "TreatUndefinedAs",
+                                "arguments": null,
+                                "rhs": {
+                                    "type": "identifier",
+                                    "value": "EmptyString"
+                                }
+                            }
+                        ],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "DOMString"
+                        },
+                        "name": "breedName"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/typedef.json

@@ -0,0 +1,226 @@
+[
+    {
+        "type": "interface",
+        "name": "Point",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "x",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "float"
+                },
+                "name": "y",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "typedef",
+        "typeExtAttrs": [],
+        "idlType": {
+            "sequence": true,
+            "generic": "sequence",
+            "nullable": false,
+            "array": false,
+            "union": false,
+            "idlType": {
+                "sequence": false,
+                "generic": null,
+                "nullable": false,
+                "array": false,
+                "union": false,
+                "idlType": "Point"
+            }
+        },
+        "name": "PointSequence",
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Rect",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Point"
+                },
+                "name": "topleft",
+                "extAttrs": []
+            },
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Point"
+                },
+                "name": "bottomright",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "interface",
+        "name": "Widget",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "Rect"
+                },
+                "name": "bounds",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "boolean"
+                },
+                "name": "pointWithinBounds",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "Point"
+                        },
+                        "name": "p"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "boolean"
+                },
+                "name": "allPointsWithinBounds",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "PointSequence"
+                        },
+                        "name": "ps"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    },
+    {
+        "type": "typedef",
+        "typeExtAttrs": [
+            {
+                "name": "Clamp",
+                "arguments": null
+            }
+        ],
+        "idlType": {
+            "sequence": false,
+            "generic": null,
+            "nullable": false,
+            "array": false,
+            "union": false,
+            "idlType": "octet"
+        },
+        "name": "value",
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/typesuffixes.json

@@ -0,0 +1,55 @@
+[
+    {
+        "type": "interface",
+        "name": "Suffixes",
+        "partial": false,
+        "members": [
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "test",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": false,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": true,
+                            "generic": "sequence",
+                            "nullable": true,
+                            "array": false,
+                            "union": false,
+                            "idlType": {
+                                "sequence": false,
+                                "generic": null,
+                                "nullable": true,
+                                "array": 1,
+                                "nullableArray": [false],
+                                "union": false,
+                                "idlType": "DOMString"
+                            }
+                        },
+                        "name": "foo"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/uniontype.json

@@ -0,0 +1,87 @@
+[
+    {
+        "type": "interface",
+        "name": "Union",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": true,
+                    "idlType": [
+                        {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "float"
+                        },
+                        {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": true,
+                            "idlType": [
+                                {
+                                    "sequence": false,
+                                    "generic": null,
+                                    "nullable": false,
+                                    "array": false,
+                                    "union": false,
+                                    "idlType": "Date"
+                                },
+                                {
+                                    "sequence": false,
+                                    "generic": null,
+                                    "nullable": false,
+                                    "array": false,
+                                    "union": false,
+                                    "idlType": "Event"
+                                }
+                            ]
+                        },
+                        {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": true,
+                            "array": false,
+                            "union": true,
+                            "idlType": [
+                                {
+                                    "sequence": false,
+                                    "generic": null,
+                                    "nullable": false,
+                                    "array": false,
+                                    "union": false,
+                                    "idlType": "Node"
+                                },
+                                {
+                                    "sequence": false,
+                                    "generic": null,
+                                    "nullable": false,
+                                    "array": false,
+                                    "union": false,
+                                    "idlType": "DOMString"
+                                }
+                            ]
+                        }
+                    ]
+                },
+                "name": "test",
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]

tests/wpt/web-platform-tests/resources/webidl2/test/syntax/json/variadic-operations.json

@@ -0,0 +1,100 @@
+[
+    {
+        "type": "interface",
+        "name": "IntegerSet",
+        "partial": false,
+        "members": [
+            {
+                "type": "attribute",
+                "static": false,
+                "stringifier": false,
+                "inherit": false,
+                "readonly": true,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "unsigned long"
+                },
+                "name": "cardinality",
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "union",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": true,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "long"
+                        },
+                        "name": "ints"
+                    }
+                ],
+                "extAttrs": []
+            },
+            {
+                "type": "operation",
+                "getter": false,
+                "setter": false,
+                "creator": false,
+                "deleter": false,
+                "legacycaller": false,
+                "static": false,
+                "stringifier": false,
+                "idlType": {
+                    "sequence": false,
+                    "generic": null,
+                    "nullable": false,
+                    "array": false,
+                    "union": false,
+                    "idlType": "void"
+                },
+                "name": "intersection",
+                "arguments": [
+                    {
+                        "optional": false,
+                        "variadic": true,
+                        "extAttrs": [],
+                        "idlType": {
+                            "sequence": false,
+                            "generic": null,
+                            "nullable": false,
+                            "array": false,
+                            "union": false,
+                            "idlType": "long"
+                        },
+                        "name": "ints"
+                    }
+                ],
+                "extAttrs": []
+            }
+        ],
+        "inheritance": null,
+        "extAttrs": []
+    }
+]