1 files changed, 91 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/selectors/case-sensitivity/values.window.js b/testing/web-platform/tests/html/semantics/selectors/case-sensitivity/values.window.js
new file mode 100644
index 0000000000..1973398bff
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/selectors/case-sensitivity/values.window.js
@@ -0,0 +1,91 @@
+// https://html.spec.whatwg.org/#case-sensitivity-of-selectors
+[
+  "accept",
+  "accept-charset",
+  "align",
+  "alink",
+  "axis",
+  "bgcolor",
+  "charset",
+  "checked",
+  "clear",
+  "codetype",
+  "color",
+  "compact",
+  "declare",
+  "defer",
+  "dir",
+  "direction",
+  "disabled",
+  "enctype",
+  "face",
+  "frame",
+  "hreflang",
+  "http-equiv",
+  "lang",
+  "language",
+  "link",
+  "media",
+  "method",
+  "multiple",
+  "nohref",
+  "noresize",
+  "noshade",
+  "nowrap",
+  "readonly",
+  "rel",
+  "rev",
+  "rules",
+  "scope",
+  "scrolling",
+  "selected",
+  "shape",
+  "target",
+  "text",
+  "type",
+  "valign",
+  "valuetype",
+  "vlink",
+].forEach(attributeName => {
+  const xmlDocument = new Document();
+  const htmlDocument = document;
+  [
+    {
+      input: xmlDocument.createElementNS("http://www.w3.org/1999/xhtml", "a"),
+      expected: false,
+      title: "<html:a> in XML",
+    },
+    {
+      input: xmlDocument.createElementNS("http://www.w3.org/1999/xhtml", "unknown"),
+      expected: false,
+      title: "<html:unknown> in XML",
+    },
+    {
+      input: xmlDocument.createElementNS("", "unknown"),
+      expected: false,
+      title: "<:unknown> in XML"
+    },
+    {
+      input: htmlDocument.createElementNS("http://www.w3.org/1999/xhtml", "a"),
+      expected: true,
+      title: "<html:a> in HTML",
+    },
+    {
+      input: htmlDocument.createElementNS("http://www.w3.org/1999/xhtml", "unknown"),
+      expected: true,
+      title: "<html:unknown> in HTML",
+    },
+    {
+      input: htmlDocument.createElementNS("", "unknown"),
+      expected: false,
+      title: "<:unknown> in HTML"
+    },
+  ].forEach(({ input, expected, title }) => {
+    test(t => {
+      t.add_cleanup(() => input.removeAttribute(attributeName));
+      input.setAttribute(attributeName, "HEYÏ");
+      assert_equals(input.matches(`[${attributeName}^=hey]`), expected, `^=hey`);
+      assert_false(input.matches(`[${attributeName}^=heyi]`));
+    }, `${attributeName}'s value is properly ASCII-case-insensitive for ${title}`);
+  });
+});