diff --git a/components/script/dom/create.rs b/components/script/dom/create.rs
index 9b226c73e33..55bef524640 100644
--- a/components/script/dom/create.rs
+++ b/components/script/dom/create.rs
@@ -116,9 +116,13 @@ pub fn create_element(name: QualName, prefix: Option<Atom>,
         atom!("base")       => make!(HTMLBaseElement),
         atom!("bdi")        => make!(HTMLElement),
         atom!("bdo")        => make!(HTMLElement),
-        atom!("bgsound")    => make!(HTMLElement),
+        // https://html.spec.whatwg.org/multipage/#other-elements,-attributes-and-apis:bgsound
+        atom!("bgsound")    => make!(HTMLUnknownElement),
         atom!("big")        => make!(HTMLElement),
-        atom!("blockquote") => make!(HTMLElement),
+        // https://html.spec.whatwg.org/multipage/#other-elements,-attributes-and-apis:blink
+        atom!("blink")      => make!(HTMLUnknownElement),
+        // https://html.spec.whatwg.org/multipage/#the-blockquote-element
+        atom!("blockquote") => make!(HTMLQuoteElement),
         atom!("body")       => make!(HTMLBodyElement),
         atom!("br")         => make!(HTMLBRElement),
         atom!("button")     => make!(HTMLButtonElement),
@@ -166,7 +170,8 @@ pub fn create_element(name: QualName, prefix: Option<Atom>,
         atom!("img")        => make!(HTMLImageElement),
         atom!("input")      => make!(HTMLInputElement),
         atom!("ins")        => make!(HTMLModElement),
-        atom!("isindex")    => make!(HTMLElement),
+        // https://html.spec.whatwg.org/multipage/#other-elements,-attributes-and-apis:isindex-2
+        atom!("isindex")    => make!(HTMLUnknownElement),
         atom!("kbd")        => make!(HTMLElement),
         atom!("label")      => make!(HTMLLabelElement),
         atom!("legend")     => make!(HTMLLegendElement),
@@ -178,7 +183,11 @@ pub fn create_element(name: QualName, prefix: Option<Atom>,
         atom!("marquee")    => make!(HTMLElement),
         atom!("meta")       => make!(HTMLMetaElement),
         atom!("meter")      => make!(HTMLMeterElement),
+        // https://html.spec.whatwg.org/multipage/#other-elements,-attributes-and-apis:multicol
+        atom!("multicol")   => make!(HTMLUnknownElement),
         atom!("nav")        => make!(HTMLElement),
+        // https://html.spec.whatwg.org/multipage/#other-elements,-attributes-and-apis:nextid
+        atom!("nextid")     => make!(HTMLUnknownElement),
         atom!("nobr")       => make!(HTMLElement),
         atom!("noframes")   => make!(HTMLElement),
         atom!("noscript")   => make!(HTMLElement),
@@ -202,7 +211,8 @@ pub fn create_element(name: QualName, prefix: Option<Atom>,
         atom!("select")     => make!(HTMLSelectElement),
         atom!("small")      => make!(HTMLElement),
         atom!("source")     => make!(HTMLSourceElement),
-        atom!("spacer")     => make!(HTMLElement),
+        // https://html.spec.whatwg.org/multipage/#other-elements,-attributes-and-apis:spacer
+        atom!("spacer")     => make!(HTMLUnknownElement),
         atom!("span")       => make!(HTMLSpanElement),
         atom!("strike")     => make!(HTMLElement),
         atom!("strong")     => make!(HTMLElement),
diff --git a/tests/wpt/metadata/html/dom/interfaces.html.ini b/tests/wpt/metadata/html/dom/interfaces.html.ini
index d8df33b0711..41ab3d979c1 100644
--- a/tests/wpt/metadata/html/dom/interfaces.html.ini
+++ b/tests/wpt/metadata/html/dom/interfaces.html.ini
@@ -2109,24 +2109,6 @@
   [HTMLUnknownElement interface: existence and properties of interface object]
     expected: FAIL
 
-  [HTMLUnknownElement must be primary interface of document.createElement("bgsound")]
-    expected: FAIL
-
-  [Stringification of document.createElement("bgsound")]
-    expected: FAIL
-
-  [HTMLUnknownElement must be primary interface of document.createElement("isindex")]
-    expected: FAIL
-
-  [Stringification of document.createElement("isindex")]
-    expected: FAIL
-
-  [HTMLUnknownElement must be primary interface of document.createElement("spacer")]
-    expected: FAIL
-
-  [Stringification of document.createElement("spacer")]
-    expected: FAIL
-
   [HTMLHtmlElement interface: existence and properties of interface object]
     expected: FAIL
 
@@ -2445,12 +2427,6 @@
   [HTMLQuoteElement interface: attribute cite]
     expected: FAIL
 
-  [HTMLQuoteElement must be primary interface of document.createElement("blockquote")]
-    expected: FAIL
-
-  [Stringification of document.createElement("blockquote")]
-    expected: FAIL
-
   [HTMLQuoteElement interface: document.createElement("blockquote") must inherit property "cite" with the proper type (0)]
     expected: FAIL
 
diff --git a/tests/wpt/metadata/html/semantics/interfaces.html.ini b/tests/wpt/metadata/html/semantics/interfaces.html.ini
index 61048ef3c0e..45a48c4a42e 100644
--- a/tests/wpt/metadata/html/semantics/interfaces.html.ini
+++ b/tests/wpt/metadata/html/semantics/interfaces.html.ini
@@ -1,14 +1,5 @@
 [interfaces.html]
   type: testharness
-  [Interfaces for bgsound]
-    expected: FAIL
-
-  [Interfaces for blockquote]
-    expected: FAIL
-
-  [Interfaces for isindex]
-    expected: FAIL
-
   [Interfaces for keygen]
     expected: FAIL
 
@@ -27,9 +18,6 @@
   [Interfaces for plaintext]
     expected: FAIL
 
-  [Interfaces for spacer]
-    expected: FAIL
-
   [Interfaces for tfoot]
     expected: FAIL
 
@@ -45,15 +33,6 @@
   [Interfaces for command]
     expected: FAIL
 
-  [Interfaces for BGSOUND]
-    expected: FAIL
-
-  [Interfaces for BLOCKQUOTE]
-    expected: FAIL
-
-  [Interfaces for ISINDEX]
-    expected: FAIL
-
   [Interfaces for KEYGEN]
     expected: FAIL
 
@@ -72,9 +51,6 @@
   [Interfaces for PLAINTEXT]
     expected: FAIL
 
-  [Interfaces for SPACER]
-    expected: FAIL
-
   [Interfaces for TFOOT]
     expected: FAIL