diff --git a/tests/wpt/include.ini b/tests/wpt/include.ini
index dc1d79c309b..82c87177c84 100644
--- a/tests/wpt/include.ini
+++ b/tests/wpt/include.ini
@@ -49,6 +49,8 @@ skip: true
   skip: false
 [referrer-policy]
   skip: false
+[selectors]
+  skip: false
 [subresource-integrity]
   skip: false
 [touch-events]
diff --git a/tests/wpt/metadata/selectors/attribute-selectors/attribute-case/cssom.html.ini b/tests/wpt/metadata/selectors/attribute-selectors/attribute-case/cssom.html.ini
new file mode 100644
index 00000000000..4b2a69d99a6
--- /dev/null
+++ b/tests/wpt/metadata/selectors/attribute-selectors/attribute-case/cssom.html.ini
@@ -0,0 +1,68 @@
+[cssom.html]
+  type: testharness
+  [[foo="bar"\] /* sanity check */ getting CSSRule#cssText]
+    expected: FAIL
+
+  [[foo="bar"\] /* sanity check */ getting CSSStyleRule#selectorText]
+    expected: FAIL
+
+  [[foo="bar"\] /* sanity check */ setting CSSStyleRule#selectorText]
+    expected: FAIL
+
+  [[foo="bar"\] /* sanity check */ getting CSSRule#cssText in @media]
+    expected: FAIL
+
+  [[foo="bar"\] /* sanity check */ getting CSSStyleRule#selectorText in @media]
+    expected: FAIL
+
+  [[foo="bar"\] /* sanity check */ setting CSSStyleRule#selectorText in @media]
+    expected: FAIL
+
+  [[foo="bar" i\] getting CSSRule#cssText]
+    expected: FAIL
+
+  [[foo="bar" i\] getting CSSStyleRule#selectorText]
+    expected: FAIL
+
+  [[foo="bar" i\] getting CSSRule#cssText in @media]
+    expected: FAIL
+
+  [[foo="bar" i\] getting CSSStyleRule#selectorText in @media]
+    expected: FAIL
+
+  [[foo="bar" /**/ i\] getting CSSRule#cssText]
+    expected: FAIL
+
+  [[foo="bar" /**/ i\] getting CSSStyleRule#selectorText]
+    expected: FAIL
+
+  [[foo="bar" /**/ i\] setting CSSStyleRule#selectorText]
+    expected: FAIL
+
+  [[foo="bar" /**/ i\] getting CSSRule#cssText in @media]
+    expected: FAIL
+
+  [[foo="bar" /**/ i\] getting CSSStyleRule#selectorText in @media]
+    expected: FAIL
+
+  [[foo="bar" /**/ i\] setting CSSStyleRule#selectorText in @media]
+    expected: FAIL
+
+  [[foo="bar"/**/i\] getting CSSRule#cssText]
+    expected: FAIL
+
+  [[foo="bar"/**/i\] getting CSSStyleRule#selectorText]
+    expected: FAIL
+
+  [[foo="bar"/**/i\] setting CSSStyleRule#selectorText]
+    expected: FAIL
+
+  [[foo="bar"/**/i\] getting CSSRule#cssText in @media]
+    expected: FAIL
+
+  [[foo="bar"/**/i\] getting CSSStyleRule#selectorText in @media]
+    expected: FAIL
+
+  [[foo="bar"/**/i\] setting CSSStyleRule#selectorText in @media]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/selectors/attribute-selectors/attribute-case/semantics.html.ini b/tests/wpt/metadata/selectors/attribute-selectors/attribute-case/semantics.html.ini
new file mode 100644
index 00000000000..804d84f3514
--- /dev/null
+++ b/tests/wpt/metadata/selectors/attribute-selectors/attribute-case/semantics.html.ini
@@ -0,0 +1,29 @@
+[semantics.html]
+  type: testharness
+  [@namespace x 'http://www.w3.org/XML/1998/namespace'; [x|lang='A' i\] <div {http://www.w3.org/XML/1998/namespace}lang="a"> in standards mode]
+    expected: FAIL
+
+  [@namespace x 'a'; [x|foo='' i\] <div {A}foo=""> in standards mode]
+    expected: FAIL
+
+  [@namespace x 'A'; [x|foo='' i\] <div {a}foo=""> in standards mode]
+    expected: FAIL
+
+  [@namespace x 'http://www.w3.org/XML/1998/namespace'; [x|lang='A' i\] <div {http://www.w3.org/XML/1998/namespace}lang="a"> in quirks mode]
+    expected: FAIL
+
+  [@namespace x 'a'; [x|foo='' i\] <div {A}foo=""> in quirks mode]
+    expected: FAIL
+
+  [@namespace x 'A'; [x|foo='' i\] <div {a}foo=""> in quirks mode]
+    expected: FAIL
+
+  [@namespace x 'http://www.w3.org/XML/1998/namespace'; [x|lang='A' i\] <div {http://www.w3.org/XML/1998/namespace}lang="a"> in XML]
+    expected: FAIL
+
+  [@namespace x 'a'; [x|foo='' i\] <div {A}foo=""> in XML]
+    expected: FAIL
+
+  [@namespace x 'A'; [x|foo='' i\] <div {a}foo=""> in XML]
+    expected: FAIL
+
diff --git a/tests/wpt/metadata/selectors/attribute-selectors/attribute-case/syntax.html.ini b/tests/wpt/metadata/selectors/attribute-selectors/attribute-case/syntax.html.ini
new file mode 100644
index 00000000000..3b4aa0649a8
--- /dev/null
+++ b/tests/wpt/metadata/selectors/attribute-selectors/attribute-case/syntax.html.ini
@@ -0,0 +1,218 @@
+[syntax.html]
+  type: testharness
+  [[foo='BAR'\] /* sanity check (valid) */ in standards mode]
+    expected: FAIL
+
+  [[foo='bar' i\] in standards mode]
+    expected: FAIL
+
+  [[foo='bar' I\] in standards mode]
+    expected: FAIL
+
+  [[foo=bar i\] in standards mode]
+    expected: FAIL
+
+  [[foo="bar" i\] in standards mode]
+    expected: FAIL
+
+  [[foo='bar'i\] in standards mode]
+    expected: FAIL
+
+  [[foo='bar'i \] in standards mode]
+    expected: FAIL
+
+  [[foo='bar' i \] in standards mode]
+    expected: FAIL
+
+  [[foo='bar' /**/ i\] in standards mode]
+    expected: FAIL
+
+  [[foo='bar' i /**/ \] in standards mode]
+    expected: FAIL
+
+  [[foo='bar'/**/i/**/\] in standards mode]
+    expected: FAIL
+
+  [[foo=bar/**/i\] in standards mode]
+    expected: FAIL
+
+  [[foo='bar'\ti\t\] /* \\t */ in standards mode]
+    expected: FAIL
+
+  [[foo='bar'\ni\n\] /* \\n */ in standards mode]
+    expected: FAIL
+
+  [[foo='bar'\ri\r\] /* \\r */ in standards mode]
+    expected: FAIL
+
+  [[foo='bar' \\i\] in standards mode]
+    expected: FAIL
+
+  [[foo='bar' \\69\] in standards mode]
+    expected: FAIL
+
+  [[foo~='bar' i\] in standards mode]
+    expected: FAIL
+
+  [[foo^='bar' i\] in standards mode]
+    expected: FAIL
+
+  [[foo$='bar' i\] in standards mode]
+    expected: FAIL
+
+  [[foo*='bar' i\] in standards mode]
+    expected: FAIL
+
+  [[foo|='bar' i\] in standards mode]
+    expected: FAIL
+
+  [[|foo='bar' i\] in standards mode]
+    expected: FAIL
+
+  [[*|foo='bar' i\] in standards mode]
+    expected: FAIL
+
+  [[foo='BAR'\] /* sanity check (valid) */ in quirks mode]
+    expected: FAIL
+
+  [[foo='bar' i\] in quirks mode]
+    expected: FAIL
+
+  [[foo='bar' I\] in quirks mode]
+    expected: FAIL
+
+  [[foo=bar i\] in quirks mode]
+    expected: FAIL
+
+  [[foo="bar" i\] in quirks mode]
+    expected: FAIL
+
+  [[foo='bar'i\] in quirks mode]
+    expected: FAIL
+
+  [[foo='bar'i \] in quirks mode]
+    expected: FAIL
+
+  [[foo='bar' i \] in quirks mode]
+    expected: FAIL
+
+  [[foo='bar' /**/ i\] in quirks mode]
+    expected: FAIL
+
+  [[foo='bar' i /**/ \] in quirks mode]
+    expected: FAIL
+
+  [[foo='bar'/**/i/**/\] in quirks mode]
+    expected: FAIL
+
+  [[foo=bar/**/i\] in quirks mode]
+    expected: FAIL
+
+  [[foo='bar'\ti\t\] /* \\t */ in quirks mode]
+    expected: FAIL
+
+  [[foo='bar'\ni\n\] /* \\n */ in quirks mode]
+    expected: FAIL
+
+  [[foo='bar'\ri\r\] /* \\r */ in quirks mode]
+    expected: FAIL
+
+  [[foo='bar' \\i\] in quirks mode]
+    expected: FAIL
+
+  [[foo='bar' \\69\] in quirks mode]
+    expected: FAIL
+
+  [[foo~='bar' i\] in quirks mode]
+    expected: FAIL
+
+  [[foo^='bar' i\] in quirks mode]
+    expected: FAIL
+
+  [[foo$='bar' i\] in quirks mode]
+    expected: FAIL
+
+  [[foo*='bar' i\] in quirks mode]
+    expected: FAIL
+
+  [[foo|='bar' i\] in quirks mode]
+    expected: FAIL
+
+  [[|foo='bar' i\] in quirks mode]
+    expected: FAIL
+
+  [[*|foo='bar' i\] in quirks mode]
+    expected: FAIL
+
+  [[foo='BAR'\] /* sanity check (valid) */ in XML]
+    expected: FAIL
+
+  [[foo='bar' i\] in XML]
+    expected: FAIL
+
+  [[foo='bar' I\] in XML]
+    expected: FAIL
+
+  [[foo=bar i\] in XML]
+    expected: FAIL
+
+  [[foo="bar" i\] in XML]
+    expected: FAIL
+
+  [[foo='bar'i\] in XML]
+    expected: FAIL
+
+  [[foo='bar'i \] in XML]
+    expected: FAIL
+
+  [[foo='bar' i \] in XML]
+    expected: FAIL
+
+  [[foo='bar' /**/ i\] in XML]
+    expected: FAIL
+
+  [[foo='bar' i /**/ \] in XML]
+    expected: FAIL
+
+  [[foo='bar'/**/i/**/\] in XML]
+    expected: FAIL
+
+  [[foo=bar/**/i\] in XML]
+    expected: FAIL
+
+  [[foo='bar'\ti\t\] /* \\t */ in XML]
+    expected: FAIL
+
+  [[foo='bar'\ni\n\] /* \\n */ in XML]
+    expected: FAIL
+
+  [[foo='bar'\ri\r\] /* \\r */ in XML]
+    expected: FAIL
+
+  [[foo='bar' \\i\] in XML]
+    expected: FAIL
+
+  [[foo='bar' \\69\] in XML]
+    expected: FAIL
+
+  [[foo~='bar' i\] in XML]
+    expected: FAIL
+
+  [[foo^='bar' i\] in XML]
+    expected: FAIL
+
+  [[foo$='bar' i\] in XML]
+    expected: FAIL
+
+  [[foo*='bar' i\] in XML]
+    expected: FAIL
+
+  [[foo|='bar' i\] in XML]
+    expected: FAIL
+
+  [[|foo='bar' i\] in XML]
+    expected: FAIL
+
+  [[*|foo='bar' i\] in XML]
+    expected: FAIL
+
diff --git a/tests/wpt/mozilla/meta/mozilla/webgl/context_creation_error.html.ini b/tests/wpt/mozilla/meta/mozilla/webgl/context_creation_error.html.ini
index e7d26a40344..54d3fa6da8a 100644
--- a/tests/wpt/mozilla/meta/mozilla/webgl/context_creation_error.html.ini
+++ b/tests/wpt/mozilla/meta/mozilla/webgl/context_creation_error.html.ini
@@ -1,3 +1,3 @@
 [context_creation_error.html]
   type: reftest
-  prefs: ["webgl.testing.context_creation_error:true"]
+  prefs: [webgl.testing.context_creation_error:true]
diff --git a/tests/wpt/mozilla/meta/mozilla/worklets/test_paint_worklet.html.ini b/tests/wpt/mozilla/meta/mozilla/worklets/test_paint_worklet.html.ini
index 2f081d45de6..b4bd067b933 100644
--- a/tests/wpt/mozilla/meta/mozilla/worklets/test_paint_worklet.html.ini
+++ b/tests/wpt/mozilla/meta/mozilla/worklets/test_paint_worklet.html.ini
@@ -1,4 +1,3 @@
 [test_paint_worklet.html]
   type: reftest
   expected: FAIL
-