From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 02:47:55 +0200
Subject: Adding upstream version 124.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../tests/html/semantics/links/META.yml            |  2 +
 .../header-origin-no-referrer-when-downgrade.html  | 20 ++++++
 .../header-origin-no-referrer.html                 | 20 ++++++
 .../header-origin-origin-when-cross-origin.html    | 20 ++++++
 .../header-origin-origin.html                      | 20 ++++++
 .../header-origin-same-origin.html                 | 20 ++++++
 ...der-origin-strict-origin-when-cross-origin.html | 20 ++++++
 .../header-origin-strict-origin.html               | 20 ++++++
 .../header-origin-unsafe-url.html                  | 20 ++++++
 .../links/downloading-resources/header-origin.html | 19 ++++++
 .../links/downloading-resources/header-origin.js   | 40 +++++++++++
 ...header-referrer-no-referrer-when-downgrade.html | 20 ++++++
 .../header-referrer-no-referrer.html               | 20 ++++++
 .../header-referrer-origin-when-cross-origin.html  | 20 ++++++
 .../header-referrer-origin.html                    | 20 ++++++
 .../header-referrer-same-origin.html               | 20 ++++++
 ...r-referrer-strict-origin-when-cross-origin.html | 20 ++++++
 .../header-referrer-strict-origin.html             | 20 ++++++
 .../header-referrer-unsafe-url.html                | 20 ++++++
 .../downloading-resources/header-referrer.html     | 19 ++++++
 .../links/downloading-resources/header-referrer.js | 40 +++++++++++
 .../resources/inspect-header.py                    | 18 +++++
 .../activation-behavior.window.js                  | 50 ++++++++++++++
 .../following-hyperlinks/active-document.window.js | 23 +++++++
 .../links/hyperlink-auditing/headers.optional.html | 55 +++++++++++++++
 .../hyperlink-auditing/resources/stash-headers.py  | 27 ++++++++
 .../htmlanchorelement_attribute-getter-setter.html | 65 ++++++++++++++++++
 .../htmlanchorelement_getter.html                  | 48 +++++++++++++
 .../htmlanchorelement_noopener.html                | 78 ++++++++++++++++++++++
 .../non-parsable-url-getter-setter.window.js       | 54 +++++++++++++++
 ...special-opaque-path-url-getter-setter.window.js | 59 ++++++++++++++++
 .../non-special-url-getter-setter.window.js        | 63 +++++++++++++++++
 .../support/noopener-popup.html                    | 19 ++++++
 .../support/noopener-target-1.html                 |  4 ++
 .../support/noopener-target-2.html                 |  8 +++
 .../support/target_blank_implicit_noopener.html    |  6 ++
 .../target_blank_implicit_noopener.html            | 58 ++++++++++++++++
 .../target_blank_implicit_noopener_base.html       | 59 ++++++++++++++++
 .../links/linktypes/alternate-css-ref.html         |  5 ++
 .../semantics/links/linktypes/alternate-css.html   |  7 ++
 .../semantics/links/linktypes/alternate-import.css |  3 +
 .../html/semantics/links/linktypes/alternate.css   |  5 ++
 ...inked-resource-ascii-case-insensitive-lower.css |  1 +
 ...inked-resource-ascii-case-insensitive-mixed.css |  1 +
 ...inked-resource-ascii-case-insensitive-other.css |  1 +
 ...linked-resource-ascii-case-insensitive-ref.html |  9 +++
 ...heet-linked-resource-ascii-case-insensitive.css |  3 +
 ...eet-linked-resource-ascii-case-insensitive.html | 14 ++++
 .../semantics/links/linktypes/original-id.json     |  1 +
 .../html/semantics/links/linktypes/preferred.css   |  3 +
 50 files changed, 1187 insertions(+)
 create mode 100644 testing/web-platform/tests/html/semantics/links/META.yml
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-no-referrer-when-downgrade.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-no-referrer.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-origin-when-cross-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-same-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-strict-origin-when-cross-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-strict-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-unsafe-url.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin.js
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-no-referrer-when-downgrade.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-no-referrer.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-origin-when-cross-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-same-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-strict-origin-when-cross-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-strict-origin.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-unsafe-url.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer.js
 create mode 100644 testing/web-platform/tests/html/semantics/links/downloading-resources/resources/inspect-header.py
 create mode 100644 testing/web-platform/tests/html/semantics/links/following-hyperlinks/activation-behavior.window.js
 create mode 100644 testing/web-platform/tests/html/semantics/links/following-hyperlinks/active-document.window.js
 create mode 100644 testing/web-platform/tests/html/semantics/links/hyperlink-auditing/headers.optional.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/hyperlink-auditing/resources/stash-headers.py
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_attribute-getter-setter.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_getter.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-parsable-url-getter-setter.window.js
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-special-opaque-path-url-getter-setter.window.js
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-special-url-getter-setter.window.js
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-popup.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-target-1.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-target-2.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/target_blank_implicit_noopener.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener_base.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/alternate-css-ref.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/alternate-css.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/alternate-import.css
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/alternate.css
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-lower.css
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-mixed.css
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-other.css
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-ref.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive.css
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive.html
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/original-id.json
 create mode 100644 testing/web-platform/tests/html/semantics/links/linktypes/preferred.css

(limited to 'testing/web-platform/tests/html/semantics/links')

diff --git a/testing/web-platform/tests/html/semantics/links/META.yml b/testing/web-platform/tests/html/semantics/links/META.yml
new file mode 100644
index 0000000000..b2167370d1
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/META.yml
@@ -0,0 +1,2 @@
+suggested_reviewers:
+  - annevk
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-no-referrer-when-downgrade.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-no-referrer-when-downgrade.html
new file mode 100644
index 0000000000..466868dd7b
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-no-referrer-when-downgrade.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Origin Header No Referrer When Downgrade Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='no-referrer-when-downgrade'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-origin.js"></script>
+    <script>
+      testOriginHeader(self.location.origin);
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-no-referrer.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-no-referrer.html
new file mode 100644
index 0000000000..cd7a1804f3
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-no-referrer.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Origin Header No Referrer Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='no-referrer'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-origin.js"></script>
+    <script>
+      testOriginHeader("null");
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-origin-when-cross-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-origin-when-cross-origin.html
new file mode 100644
index 0000000000..98115aa653
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-origin-when-cross-origin.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Origin Header Origin When Cross Origin Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='origin-when-cross-origin'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-origin.js"></script>
+    <script>
+      testOriginHeader(self.location.origin);
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-origin.html
new file mode 100644
index 0000000000..194ca9d4ad
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-origin.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Origin Header Origin Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='origin'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-origin.js"></script>
+    <script>
+      testOriginHeader(self.location.origin);
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-same-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-same-origin.html
new file mode 100644
index 0000000000..eb86708d5b
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-same-origin.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Origin Header Same Origin Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='same-origin'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-origin.js"></script>
+    <script>
+      testOriginHeader(self.location.origin);
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-strict-origin-when-cross-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-strict-origin-when-cross-origin.html
new file mode 100644
index 0000000000..f6514ff2ae
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-strict-origin-when-cross-origin.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Origin Header Strict Origin When Cross Origin Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='strict-origin-when-cross-origin'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-origin.js"></script>
+    <script>
+      testOriginHeader(self.location.origin);
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-strict-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-strict-origin.html
new file mode 100644
index 0000000000..4aa311e833
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-strict-origin.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Origin Header Strict Origin Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='strict-origin'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-origin.js"></script>
+    <script>
+      testOriginHeader(self.location.origin);
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-unsafe-url.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-unsafe-url.html
new file mode 100644
index 0000000000..59742404fe
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin-unsafe-url.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Origin Header Unsafe Url Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='unsafe-url'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-origin.js"></script>
+    <script>
+      testOriginHeader(self.location.origin);
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin.html
new file mode 100644
index 0000000000..189e2e66d4
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Origin no Referrer Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-origin.js"></script>
+    <script>
+      testOriginHeader(self.location.origin);
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin.js b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin.js
new file mode 100644
index 0000000000..acc62ef93b
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-origin.js
@@ -0,0 +1,40 @@
+const RESOURCES_DIR = "/html/semantics/links/downloading-resources/resources/";
+
+function testOriginHeader(expectedOrigin) {
+  var id = self.token();
+  let testUrl = RESOURCES_DIR + "inspect-header.py?header=origin&cmd=put&id=" + id;
+
+  promise_test(function(test) {
+    const anchor = document.getElementById("a");
+    anchor.setAttribute("ping", testUrl);
+    anchor.click();
+    return pollResult(id) .then(result => {
+      assert_equals(result, expectedOrigin, "Correct origin header result");
+    });
+  }, "Test origin header " + RESOURCES_DIR);
+}
+
+// Sending a ping is an asynchronous and non-blocking request to a web server.
+// We may have to create a poll loop to get result from server
+function pollResult(id) {
+  let checkUrl = RESOURCES_DIR + "inspect-header.py?header=origin&cmd=get&id=" + id;
+
+  return new Promise(resolve => {
+    function checkResult() {
+      fetch(checkUrl).then(
+        function(response) {
+          assert_equals(response.status, 200, "Inspect header response's status is 200");
+          let result = response.headers.get("x-request-origin");
+
+          if (result != undefined) {
+            resolve(result);
+          } else {
+            step_timeout(checkResult.bind(this), 100);
+          }
+        });
+    }
+
+    checkResult();
+  });
+
+}
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-no-referrer-when-downgrade.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-no-referrer-when-downgrade.html
new file mode 100644
index 0000000000..96c19d1d0e
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-no-referrer-when-downgrade.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Referrer Header No Referrer When Downgrade Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='no-referrer-when-downgrade'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-referrer.js"></script>
+    <script>
+      testReferrerHeader("");
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-no-referrer.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-no-referrer.html
new file mode 100644
index 0000000000..065063075c
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-no-referrer.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Referrer Header No Referrer Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='no-referrer'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-referrer.js"></script>
+    <script>
+      testReferrerHeader("");
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-origin-when-cross-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-origin-when-cross-origin.html
new file mode 100644
index 0000000000..f0394261a1
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-origin-when-cross-origin.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Referrer Header Origin When Cross Origin Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='origin-when-cross-origin'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-referrer.js"></script>
+    <script>
+      testReferrerHeader("");
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-origin.html
new file mode 100644
index 0000000000..bef435581c
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-origin.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Referrer Header Origin Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='origin'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-referrer.js"></script>
+    <script>
+      testReferrerHeader("");
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-same-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-same-origin.html
new file mode 100644
index 0000000000..19b2d022af
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-same-origin.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Referrer Header Same Origin Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='same-origin'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-referrer.js"></script>
+    <script>
+      testReferrerHeader("");
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-strict-origin-when-cross-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-strict-origin-when-cross-origin.html
new file mode 100644
index 0000000000..95132eee5c
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-strict-origin-when-cross-origin.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Referrer Header Strict Origin When Cross Origin Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='strict-origin-when-cross-origin'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-referrer.js"></script>
+    <script>
+      testReferrerHeader("");
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-strict-origin.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-strict-origin.html
new file mode 100644
index 0000000000..e2678e8de8
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-strict-origin.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Referrer Header Strict Origin Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='strict-origin'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-referrer.js"></script>
+    <script>
+      testReferrerHeader("");
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-unsafe-url.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-unsafe-url.html
new file mode 100644
index 0000000000..cc3d1dde86
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer-unsafe-url.html
@@ -0,0 +1,20 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute Referrer Header Unsafe Url Policy</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <meta name='referrer' content='unsafe-url'>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-referrer.js"></script>
+    <script>
+      testReferrerHeader("");
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer.html b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer.html
new file mode 100644
index 0000000000..5e2d136443
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer.html
@@ -0,0 +1,19 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Ping attribute no Referrer Header given</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <a id="a" href="#">
+    <script src="/common/utils.js"></script>
+    <script src="/common/get-host-info.sub.js"></script>
+    <script src="/resources/chromium/enable-hyperlink-auditing.js"></script>
+    <script src="header-referrer.js"></script>
+    <script>
+      testReferrerHeader("");
+    </script>
+  </body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer.js b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer.js
new file mode 100644
index 0000000000..818649fbff
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/header-referrer.js
@@ -0,0 +1,40 @@
+const RESOURCES_DIR = "/html/semantics/links/downloading-resources/resources/";
+
+function testReferrerHeader(expectedReferrer) {
+  let id = self.token();
+  let testUrl = RESOURCES_DIR + "inspect-header.py?header=referer&cmd=put&id=" + id;
+
+  promise_test(function(test) {
+    const anchor = document.getElementById("a");
+    anchor.setAttribute("ping", testUrl);
+    anchor.click();
+    return pollResult(id) .then(result => {
+      assert_equals(result, expectedReferrer, "Correct referrer header result");
+    });
+  }, "Test referer header " + RESOURCES_DIR);
+}
+
+// Sending a ping is an asynchronous and non-blocking request to a web server.
+// We may have to create a poll loop to get result from server
+function pollResult(id) {
+  let checkUrl = RESOURCES_DIR + "inspect-header.py?header=referer&cmd=get&id=" + id;
+
+  return new Promise(resolve => {
+    function checkResult() {
+      fetch(checkUrl).then(
+        function(response) {
+          assert_equals(response.status, 200, "Inspect header response's status is 200");
+          let result = response.headers.get("x-request-referer");
+
+          if (result != undefined) {
+            resolve(result);
+          } else {
+            step_timeout(checkResult.bind(this), 100);
+          }
+        });
+    }
+
+    checkResult();
+  });
+
+}
diff --git a/testing/web-platform/tests/html/semantics/links/downloading-resources/resources/inspect-header.py b/testing/web-platform/tests/html/semantics/links/downloading-resources/resources/inspect-header.py
new file mode 100644
index 0000000000..2c68e475ff
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/downloading-resources/resources/inspect-header.py
@@ -0,0 +1,18 @@
+def main(request, response):
+    headers = [(b"Content-Type", b"text/plain")]
+    command = request.GET.first(b"cmd").lower()
+    test_id = request.GET.first(b"id")
+    header = request.GET.first(b"header")
+    if command == b"put":
+        request.server.stash.put(test_id, request.headers.get(header, b""))
+
+    elif command == b"get":
+        stashed_header = request.server.stash.take(test_id)
+        if stashed_header is not None:
+            headers.append((b"x-request-" + header, stashed_header))
+
+    else:
+        response.set_error(400, u"Bad Command")
+        return b"ERROR: Bad Command!"
+
+    return headers, b""
diff --git a/testing/web-platform/tests/html/semantics/links/following-hyperlinks/activation-behavior.window.js b/testing/web-platform/tests/html/semantics/links/following-hyperlinks/activation-behavior.window.js
new file mode 100644
index 0000000000..d530642b9e
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/following-hyperlinks/activation-behavior.window.js
@@ -0,0 +1,50 @@
+["a",
+ "area"].forEach(type => {
+
+  const followed = type === "a" ? true : false;
+  async_test(t => {
+    const target = document.createElement("iframe"),
+          link = document.createElement(type);
+    t.add_cleanup(() => target.remove());
+    target.name = "certifiedrandom" + type;
+    link.target = "certifiedrandom" + type;
+    link.href = "/";
+    document.body.appendChild(target);
+    target.onload = t.step_func(() => {
+      if(target.contentWindow.location.href === "about:blank")
+        return;
+      if(followed) {
+        assert_equals(target.contentWindow.location.pathname, "/");
+        t.done();
+      } else {
+        assert_unreached();
+      }
+    });
+    link.click();
+    t.step_timeout(() => {
+      if(followed) {
+        assert_unreached();
+      } else {
+        t.done();
+      }
+    }, 500);
+  }, "<" + type + "> that is not connected should " + (followed ? "" : "not ") + "be followed");
+
+  async_test(t => {
+    const target = document.createElement("iframe"),
+          doc = document.implementation.createDocument("", ""),
+          link = doc.createElementNS("http://www.w3.org/1999/xhtml", type);
+    t.add_cleanup(() => target.remove());
+    target.name = "certifiedrandom2" + type;
+    link.target = "certifiedrandom2" + type;
+    link.href = "/";
+    document.body.appendChild(target);
+    target.onload = t.step_func(() => {
+      if(target.contentWindow.location.href === "about:blank")
+        return;
+      assert_unreached();
+    });
+    link.click();
+    t.step_timeout(() => t.done(), 500);
+  }, "<" + type + "> that is from an inactive document should not be followed");
+});
diff --git a/testing/web-platform/tests/html/semantics/links/following-hyperlinks/active-document.window.js b/testing/web-platform/tests/html/semantics/links/following-hyperlinks/active-document.window.js
new file mode 100644
index 0000000000..efa16e7d17
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/following-hyperlinks/active-document.window.js
@@ -0,0 +1,23 @@
+["a",
+ "area",
+ "link"].forEach(type => {
+  async_test(t => {
+    const frame = document.createElement("iframe"),
+          link = document.createElement(type);
+    t.add_cleanup(() => frame.remove());
+    frame.onload = t.step_func(() => {
+      // See https://github.com/whatwg/html/issues/490
+      if(frame.contentWindow.location.href === "about:blank")
+        return;
+      link.click(); // must be ignored because document is not active
+      t.step_timeout(() => {
+        assert_equals(frame.contentWindow.location.pathname, "/common/blank.html");
+        t.done();
+      }, 500);
+    });
+    document.body.appendChild(frame);
+    frame.contentDocument.body.appendChild(link);
+    link.href = "/";
+    frame.src = "/common/blank.html";
+  }, "<" + type + "> in navigated away <iframe>'s document cannot follow hyperlinks");
+});
diff --git a/testing/web-platform/tests/html/semantics/links/hyperlink-auditing/headers.optional.html b/testing/web-platform/tests/html/semantics/links/hyperlink-auditing/headers.optional.html
new file mode 100644
index 0000000000..dd524fa5fa
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/hyperlink-auditing/headers.optional.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/utils.js"></script>
+
+<iframe id="i" src="/common/blank.html"></iframe>
+
+<!-- Test is optional because hyperlink auditing is optional. -->
+
+<script>
+promise_test(async t => {
+  await new Promise(resolve => window.onload = resolve);
+
+  const id = token();
+
+  const el = document.createElement("a");
+  el.ping = new URL(`resources/stash-headers.py?id=${id}`, location.href); // this will be a POST
+  el.href = "/common/blank.html?1";
+
+  i.contentDocument.body.append(el);
+  el.click();
+
+  let headers;
+  await pollForConditionFunc(t, async () => {
+    const res = await fetch(el.ping); // this will be a GET
+    const json = await res.json();
+
+    if (json !== "no headers yet") {
+      headers = json;
+      return true;
+    }
+    return false;
+  });
+
+  assert_equals(headers["content-type"], "text/ping", "content-type");
+  assert_equals(headers["ping-from"], i.src, "ping-from");
+  assert_equals(headers["ping-to"], el.href, "ping-to");
+});
+
+async function pollForConditionFunc(t, func, timeout = 3000, interval = 100) {
+  let remaining = Math.ceil(timeout / interval);
+
+  while (remaining > 0) {
+    --remaining;
+    await new Promise(resolve => t.step_timeout(resolve, interval));
+
+    if (await func()) {
+      return;
+    }
+  }
+
+  assert_true(false, "Condition never became true");
+}
+</script>
diff --git a/testing/web-platform/tests/html/semantics/links/hyperlink-auditing/resources/stash-headers.py b/testing/web-platform/tests/html/semantics/links/hyperlink-auditing/resources/stash-headers.py
new file mode 100644
index 0000000000..a0d4a38812
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/hyperlink-auditing/resources/stash-headers.py
@@ -0,0 +1,27 @@
+import json
+from wptserve.utils import isomorphic_decode
+
+def main(request, response):
+    key = request.GET[b"id"]
+
+    if request.method == "POST":
+      content_type = request.headers.get(b"content-type", b"no content-type header")
+      ping_from = request.headers.get(b"ping-from", b"no ping-from header")
+      ping_to = request.headers.get(b"ping-to", b"no ping-to header")
+
+      value = json.dumps({
+        'content-type': isomorphic_decode(content_type),
+        'ping-from': isomorphic_decode(ping_from),
+        'ping-to': isomorphic_decode(ping_to)
+      })
+      request.server.stash.put(key, value)
+
+      return (204, [], "")
+
+    elif request.method == "GET":
+      value = request.server.stash.take(key)
+      if value is None:
+        value = "\"no headers yet\""
+      return (200, [("Content-Type", "application/json")], str(value))
+
+    return (405, [], "")
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_attribute-getter-setter.html b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_attribute-getter-setter.html
new file mode 100644
index 0000000000..2db3082e21
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_attribute-getter-setter.html
@@ -0,0 +1,65 @@
+<!doctype html>
+<meta charset="utf-8">
+<html>
+<head>
+<title>HTMLAnchorElement getters and setters</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<a>anchor</a>
+<script>
+function test_gettersetter(property, oldresult, newval, newresult, oldurl, newurl) {
+  var a = document.querySelector('a');
+  a.href = oldurl;
+  var r1 = a[property];
+  assert_equals(r1, oldresult);
+  a[property] = newval;
+  var r2 = a[property];
+  assert_equals(r2, newresult);
+  var r3 = a.href;
+  assert_equals(r3, newurl);
+}
+
+//Elements for each test: [property, oldresult, newvalue, newresult, oldurl, newurl]
+//                         [0]       [1]        [2]       [3]        [4]     [5]
+tests = [
+  ["hash", "#somehash", "someother", "#someother",
+   "http://google.com/index.html#somehash",
+   "http://google.com/index.html#someother"],
+  ["hash", "#somehash", "#someother", "#someother",
+   "http://google.com/index.html#somehash",
+   "http://google.com/index.html#someother"],
+  ["host", "google.com:1234", "github.com:4444", "github.com:4444",
+   "http://google.com:1234/somedir",
+   "http://github.com:4444/somedir"],
+  ["hostname", "google.com", "github.com", "github.com",
+   "http://google.com:1234/somedir",
+   "http://github.com:1234/somedir"],
+  ["href", "http://google.com:1234/somedir", "http://goo-gle.com:1234/other/x.html", "http://goo-gle.com:1234/other/x.html",
+   "http://google.com:1234/somedir",
+   "http://goo-gle.com:1234/other/x.html"],
+  ["password", "flabada", "blubb", "blubb",
+   "https://anonymous:flabada@developer.mozilla.org/en-US/docs/",
+   "https://anonymous:blubb@developer.mozilla.org/en-US/docs/"],
+  ["pathname", "/somedir/someotherdir/index.html", "/newpath/x.txt", "/newpath/x.txt",
+   "http://google.com:1234/somedir/someotherdir/index.html",
+   "http://google.com:1234/newpath/x.txt"],
+  ["port", "1234", "4444", "4444", "http://google.com:1234/somedir", "http://google.com:4444/somedir"],
+  ["protocol", "http:", "ftp:", "ftp:", "http://google.com/somedir", "ftp://google.com/somedir"],
+  ["protocol", "http:", "ftp", "ftp:", "http://google.com/somedir", "ftp://google.com/somedir"],
+  ["search", "?ho", "?hi", "?hi", "http://google.com/q.php?ho", "http://google.com/q.php?hi"],
+  ["search", "?ho", "hi", "?hi", "http://google.com/q.php?ho", "http://google.com/q.php?hi"],
+  ["search", "?ho", "?hi", "?hi", "http://google.com/?ho", "http://google.com/?hi"],
+  ["search", "?ho", "hi", "?hi", "http://google.com/?ho", "http://google.com/?hi"],
+  ["username", "anonymous", "wellknown", "wellknown",
+   "https://anonymous:pwd@developer.mozilla.org:1234/en-US/",
+   "https://wellknown:pwd@developer.mozilla.org:1234/en-US/"]
+];
+
+for (var i = 0; i < tests.length; i++) {
+    test(function() {
+        test_gettersetter(tests[i][0], tests[i][1], tests[i][2], tests[i][3], tests[i][4], tests[i][5])
+    }, "Getter and setter for attribute of anchor element(" + i + "):" + tests[i][0] );
+}
+</script>
+</head>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_getter.html b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_getter.html
new file mode 100644
index 0000000000..759eada220
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_getter.html
@@ -0,0 +1,48 @@
+<!doctype html>
+<meta charset="utf-8">
+<html>
+<head>
+<title>HTMLAnchorElement getters test</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<a id=a1 href="http://google.com?hi">a1</a>
+<a id=a2 href="http://google.com#somehash">a2</a>
+<a id=a3 href="http://google.com:1234/somedir">a3</a>
+<a id=a4 href="http://google.com:1234/somedir">a4</a>
+<a id=a5 href="http://google.com:1234/somedir">a5</a>
+<a id=a6 href="https://anonymous:flabada@developer.mozilla.org/en-US/docs/">a6</a>
+<a id=a7 href="http://google.com:1234/somedir/someotherdir/index.html">a7</a>
+<a id=a8 href="http://google.com:1234/somedir">a8</a>
+<a id=a9 href="http://google.com/somedir">a9</a>
+<a id=a10 href="https://anonymous:pwd@developer.mozilla.org:1234/en-US/">a10</a>
+<script>
+function test_getter(property, result, id) {
+  var a = document.getElementById(id);
+  var r = a[property];
+  assert_equals(r, result);
+}
+
+//Elements for each test: [property, result, id]
+//                         [0]       [1]     [2]
+tests = [
+  ["search", "?hi", "a1"],
+  ["hash", "#somehash", "a2"],
+  ["host", "google.com:1234", "a3"],
+  ["hostname", "google.com", "a4"],
+  ["href", "http://google.com:1234/somedir", "a5"],
+  ["password", "flabada", "a6"],
+  ["pathname", "/somedir/someotherdir/index.html", "a7"],
+  ["port", "1234",  "a8"],
+  ["protocol", "http:", "a9"],
+  ["username", "anonymous", "a10"]
+];
+
+for (var i = 0; i < tests.length; i++) {
+    test(function() {
+        test_getter(tests[i][0], tests[i][1], tests[i][2])
+    }, "Getter for attribute of anchor element(" + i + "):" + tests[i][0]);
+}
+</script>
+</head>
+</html>
+
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html
new file mode 100644
index 0000000000..95ab1c81fb
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/htmlanchorelement_noopener.html
@@ -0,0 +1,78 @@
+<!doctype html>
+<meta charset=utf-8>
+<title>Test behavior of rel="noopener" links</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<iframe name="oursubframe"></iframe>
+<a href="support/noopener-target-2.html" rel="noopener" target="ourpopup"></a>
+<a href="support/noopener-target-2.html" rel="noopener" target="oursubframe"></a>
+<script>
+var tests = [];
+// First test the special targets
+function target1Loaded(win) {
+  // Find the relevant test
+  var test = tests.find((t) => t.openedWindow == win);
+  test.step(function() {
+    assert_equals(win.opener, window);
+    win.close();
+    test.done();
+  });
+}
+/**
+ * Test that <a rel="noopener"> targeted at one of _self, _parent, _top does the
+ * load in the appropriate existing browsing context instead of opening a new
+ * one.  The test is run in a separate popup window we open and which we can
+ * navigate without causing the test harness going into conniptions.
+ */
+for (var target of ["self", "parent", "top"]) {
+  var t = async_test("Check that rel=noopener with target=_" + target + " does a normal load");
+  tests.push(t);
+  t.openedWindow = window.open("support/noopener-popup.html");
+  t.targetName = target;
+  t.openedWindow.onload = t.step_func(function() {
+    this.openedWindow.findLink(this.targetName).click();
+  });
+}
+
+/**
+ * And now check that a noopener load targeted at something other than one of
+ * the three special targets above is still able to reuse existing things with the
+ * given name.  We do this in two ways.  First, by opening a window named
+ * "ourpopup" and then doing a load via <a rel="noopener" target="ourpopup"> and
+ * verifying that the load happens in a window with a null opener, etc, while
+ * the opener of the thing we opened is not modified.  And second, by targeting
+ * <a rel="noopener"> at a name that an existing subframe has, and ensuring that
+ * this subframe is not navigated.
+ */
+var t1 = async_test("Check that targeting of rel=noopener with a given name reuses an existing window with that name");
+var w;
+t1.add_cleanup(function() { w.close(); });
+var channel = new BroadcastChannel("ourpopup");
+channel.onmessage = t1.step_func_done(function(e) {
+  var data = e.data;
+  assert_true(data.hasOpener);
+  assert_false(data.hasParent);
+  assert_equals(data.name, "ourpopup");
+  assert_equals(w.opener, window);
+  assert_not_equals(w.location.href, "about:blank");
+});
+t1.step(function() {
+  w = window.open("", "ourpopup");
+  assert_equals(w.opener, window);
+  document.querySelectorAll("a")[0].click();
+});
+
+var t2 = async_test("Check that targeting of rel=noopener with a given name reuses an existing subframe with that name");
+var channel = new BroadcastChannel("oursubframe");
+channel.onmessage = t2.step_func_done(function(e) {
+  var data = e.data;
+  assert_false(data.hasOpener);
+  assert_true(data.hasParent);
+  assert_equals(data.name, "oursubframe");
+  assert_not_equals(document.querySelector("iframe").contentWindow.location.href,
+                    "about:blank");
+});
+t2.step(function() {
+  document.querySelectorAll("a")[1].click();
+});
+</script>
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-parsable-url-getter-setter.window.js b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-parsable-url-getter-setter.window.js
new file mode 100644
index 0000000000..587f9b9c46
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-parsable-url-getter-setter.window.js
@@ -0,0 +1,54 @@
+[
+  {
+    "property": "origin",
+    "set": null
+  },
+  {
+    "property": "protocol",
+    "get": ":",
+    "set": "https"
+  },
+  {
+    "property": "username"
+  },
+  {
+    "property": "password"
+  },
+  {
+    "property": "host"
+  },
+  {
+    "property": "hostname"
+  },
+  {
+    "property": "port",
+    "set": "8000"
+  },
+  {
+    "property": "pathname"
+  },
+  {
+    "property": "search"
+  },
+  {
+    "property": "hash"
+  }
+].forEach(({ property, get = "", set = "string" }) => {
+  ["a", "area"].forEach(name => {
+    test(() => {
+      const link = document.createElement(name);
+      link.href = "http://test:test/"; // non-parsable URL
+      assert_equals(link[property], get);
+    }, `<${name} href="http://test:test/">.${property} getter`);
+
+    if (set !== null) {
+      test(() => {
+        const link = document.createElement(name);
+        link.href = "http://test:test/"; // non-parsable URL
+        link[property] = set;
+        assert_equals(link[property], get);
+        assert_equals(link.href, "http://test:test/");
+      }, `<${name} href="http://test:test/">.${property} setter`);
+    }
+  });
+});
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-special-opaque-path-url-getter-setter.window.js b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-special-opaque-path-url-getter-setter.window.js
new file mode 100644
index 0000000000..9549c6e2a6
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-special-opaque-path-url-getter-setter.window.js
@@ -0,0 +1,59 @@
+[
+  {
+    "property": "origin",
+    "get": "null",
+    "set": null
+  },
+  {
+    "property": "protocol",
+    "get": "non-special:",
+    "set": "super-special",
+    "setget": "super-special:"
+  },
+  {
+    "property": "username"
+  },
+  {
+    "property": "password"
+  },
+  {
+    "property": "host",
+  },
+  {
+    "property": "hostname",
+  },
+  {
+    "property": "port",
+    "set": "8000"
+  },
+  {
+    "property": "pathname",
+    "get": "opaque",
+    "setget": "opaque"
+  },
+  {
+    "property": "search",
+    "setget": "?string"
+  },
+  {
+    "property": "hash",
+    "setget": "#string"
+  }
+].forEach(({ property, get = "", set = "string", setget = get }) => {
+  ["a", "area"].forEach(name => {
+    test(() => {
+      const link = document.createElement(name);
+      link.href = "non-special:opaque";
+      assert_equals(link[property], get);
+    }, `<${name} href="non-special:opaque">.${property} getter`);
+
+    if (set !== null) {
+      test(() => {
+        const link = document.createElement(name);
+        link.href = "non-special:opaque";
+        link[property] = set;
+        assert_equals(link[property], setget);
+      }, `<${name} href="non-special:opaque">.${property} setter`);
+    }
+  });
+});
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-special-url-getter-setter.window.js b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-special-url-getter-setter.window.js
new file mode 100644
index 0000000000..de528a2f97
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/non-special-url-getter-setter.window.js
@@ -0,0 +1,63 @@
+[
+  {
+    "property": "origin",
+    "get": "null",
+    "set": null
+  },
+  {
+    "property": "protocol",
+    "get": "non-special:",
+    "set": "super-special",
+    "setget": "super-special:"
+  },
+  {
+    "property": "username"
+  },
+  {
+    "property": "password"
+  },
+  {
+    "property": "host",
+    "get": "test:9001",
+    "setget": "string:9001"
+  },
+  {
+    "property": "hostname",
+    "get": "test"
+  },
+  {
+    "property": "port",
+    "get": "9001",
+    "set": "8000"
+  },
+  {
+    "property": "pathname",
+    "get": "/",
+    "setget": "/string"
+  },
+  {
+    "property": "search",
+    "setget": "?string"
+  },
+  {
+    "property": "hash",
+    "setget": "#string"
+  }
+].forEach(({ property, get = "", set = "string", setget = set }) => {
+  ["a", "area"].forEach(name => {
+    test(() => {
+      const link = document.createElement(name);
+      link.href = "non-special://test:9001/";
+      assert_equals(link[property], get);
+    }, `<${name} href="non-special://test:9001/">.${property} getter`);
+
+    if (set !== null) {
+      test(() => {
+        const link = document.createElement(name);
+        link.href = "non-special://test:9001/";
+        link[property] = set;
+        assert_equals(link[property], setget);
+      }, `<${name} href="non-special://test:9001/">.${property} setter`);
+    }
+  });
+});
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-popup.html b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-popup.html
new file mode 100644
index 0000000000..2057dbf0be
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-popup.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<script>
+  function findLink(arg) {
+    var doc;
+    if (arg == "self") {
+      doc = document;
+    } else {
+      doc = frames[0].document;
+    }
+    return doc.getElementById(arg + "target");
+  }
+</script>
+<a rel="noopener" target="_self" id="selftarget"
+   href="noopener-target-1.html"></a>
+<iframe srcdoc='
+        <a rel="noopener" target="_parent" id="parenttarget"
+           href="noopener-target-1.html"></a>
+        <a rel="noopener" target="_top" id="toptarget"
+           href="noopener-target-1.html"></a>'></iframe>
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-target-1.html b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-target-1.html
new file mode 100644
index 0000000000..0dbd14275c
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-target-1.html
@@ -0,0 +1,4 @@
+<!DOCTYPE html>
+<script>
+  opener.target1Loaded(this);
+</script>
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-target-2.html b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-target-2.html
new file mode 100644
index 0000000000..dd2d719134
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/noopener-target-2.html
@@ -0,0 +1,8 @@
+<!DOCTYPE html>
+<script>
+  var channel = new BroadcastChannel(this.name);
+  channel.postMessage({ hasOpener: opener !== null ,
+                        hasParent: parent != this,
+                        name: window.name });
+  window.close();
+</script>
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/target_blank_implicit_noopener.html b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/target_blank_implicit_noopener.html
new file mode 100644
index 0000000000..bf6a1ae5bf
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/support/target_blank_implicit_noopener.html
@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<script>
+  let bc = new BroadcastChannel(window.location.search.substring(1));
+  bc.postMessage({ hasOpener: opener !== null });
+  window.close();
+</script>
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener.html b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener.html
new file mode 100644
index 0000000000..73eebaff70
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener.html
@@ -0,0 +1,58 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset=utf-8>
+  <meta name="timeout" content="long">
+  <title>Test behavior of target=_blank links</title>
+  <script src=/resources/testharness.js></script>
+  <script src=/resources/testharnessreport.js></script>
+</head>
+<body>
+  <a href="support/target_blank_implicit_noopener.html?a1" id="a1" rel="noopener" target="_blank">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a2" id="a2" rel="opener" target="_blank">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a3" id="a3" target="_blank">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a4" id="a4" rel="opener noopener" target="_blank">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a5" id="a5" rel="noopener opener" target="_blank">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a6" id="a6" rel="noreferrer" target="_blank">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a7" id="a7" rel="opener noreferrer" target="_blank">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a8" id="a8" rel="noopener opener noreferrer" target="_blank">Click me</a>
+
+  <!-- Although this is not valid, per the processing model of area it ought to work -->
+  <area shape="rect" coords="0,0,99,50" href="support/target_blank_implicit_noopener.html?area1" id="area1" rel="noopener" target="_blank">
+  <area shape="rect" coords="0,0,99,50" href="support/target_blank_implicit_noopener.html?area2" id="area2" rel="opener" target="_blank">
+  <area shape="rect" coords="0,0,99,50" href="support/target_blank_implicit_noopener.html?area3" id="area3" target="_blank">
+  <area shape="rect" coords="0,0,99,50" href="support/target_blank_implicit_noopener.html?area4" id="area4" rel="opener noopener" target="_blank">
+  <area shape="rect" coords="0,0,99,50" href="support/target_blank_implicit_noopener.html?area5" id="area5" rel="noopener opener" target="_blank">
+
+  <script>
+
+  let tests = [
+    { id: "a1", hasOpener: false, name: "Anchor element with target=_blank with rel=noopener" },
+    { id: "a2", hasOpener: true, name: "Anchor element with target=_blank with rel=opener" },
+    { id: "a3", hasOpener: false, name: "Anchor element with target=_blank with implicit rel=noopener" },
+    { id: "a4", hasOpener: false, name: "Anchor element with target=_blank with rel=opener+noopener" },
+    { id: "a5", hasOpener: false, name: "Anchor element with target=_blank with rel=noopener+opener" },
+    { id: "a6", hasOpener: false, name: "Anchor element with target=_blank with rel=noreferrer" },
+    { id: "a7", hasOpener: false, name: "Anchor element with target=_blank with rel=opener+noreferrer" },
+    { id: "a8", hasOpener: false, name: "Anchor element with target=_blank with rel=noopener+opener+noreferrer" },
+    { id: "area1", hasOpener: false, name: "Area element with target=_blank with rel=noopener" },
+    { id: "area2", hasOpener: true, name: "Area element with target=_blank with rel=opener" },
+    { id: "area3", hasOpener: false, name: "Area element with target=_blank with implicit rel=noopener" },
+    { id: "area4", hasOpener: false, name: "Area element with target=_blank with rel=opener+noopener" },
+    { id: "area5", hasOpener: false, name: "Area element with target=_blank with rel=noopener+opener" },
+  ];
+
+  tests.forEach(data => {
+    async_test(
+      test => {
+        let bc = new BroadcastChannel(data.id);
+        bc.addEventListener("message", test.step_func_done(e => {
+          assert_equals(e.data.hasOpener, data.hasOpener);
+        }), {once: true});
+
+        document.getElementById(data.id).click();
+      }, data.name);
+  });
+  </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener_base.html b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener_base.html
new file mode 100644
index 0000000000..3da6a49ef8
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/links-created-by-a-and-area-elements/target_blank_implicit_noopener_base.html
@@ -0,0 +1,59 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset=utf-8>
+  <meta name="timeout" content="long">
+  <title>Test behavior of base target=_blank links</title>
+  <script src=/resources/testharness.js></script>
+  <script src=/resources/testharnessreport.js></script>
+  <base target=_blank>
+</head>
+<body>
+  <a href="support/target_blank_implicit_noopener.html?a1" id="a1" rel="noopener">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a2" id="a2" rel="opener">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a3" id="a3">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a4" id="a4" rel="opener noopener">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a5" id="a5" rel="noopener opener">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a6" id="a6" rel="noreferrer">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a7" id="a7" rel="opener noreferrer">Click me</a>
+  <a href="support/target_blank_implicit_noopener.html?a8" id="a8" rel="noopener opener noreferrer">Click me</a>
+
+  <!-- Although this is not valid, per the processing model of area it ought to work -->
+  <area shape="rect" coords="0,0,99,50" href="support/target_blank_implicit_noopener.html?area1" id="area1" rel="noopener">
+  <area shape="rect" coords="0,0,99,50" href="support/target_blank_implicit_noopener.html?area2" id="area2" rel="opener">
+  <area shape="rect" coords="0,0,99,50" href="support/target_blank_implicit_noopener.html?area3" id="area3">
+  <area shape="rect" coords="0,0,99,50" href="support/target_blank_implicit_noopener.html?area4" id="area4" rel="opener noopener">
+  <area shape="rect" coords="0,0,99,50" href="support/target_blank_implicit_noopener.html?area5" id="area5" rel="noopener opener">
+
+  <script>
+
+  let tests = [
+    { id: "a1", hasOpener: false, name: "Anchor element with base target=_blank with rel=noopener" },
+    { id: "a2", hasOpener: true, name: "Anchor element with base target=_blank with rel=opener" },
+    { id: "a3", hasOpener: false, name: "Anchor element with base target=_blank with implicit rel=noopener" },
+    { id: "a4", hasOpener: false, name: "Anchor element with base target=_blank with rel=opener+noopener" },
+    { id: "a5", hasOpener: false, name: "Anchor element with base target=_blank with rel=noopener+opener" },
+    { id: "a6", hasOpener: false, name: "Anchor element with base target=_blank with rel=noreferrer" },
+    { id: "a7", hasOpener: false, name: "Anchor element with base target=_blank with rel=opener+noreferrer" },
+    { id: "a8", hasOpener: false, name: "Anchor element with base target=_blank with rel=noopener+opener+noreferrer" },
+    { id: "area1", hasOpener: false, name: "Area element with base target=_blank with rel=noopener" },
+    { id: "area2", hasOpener: true, name: "Area element with base target=_blank with rel=opener" },
+    { id: "area3", hasOpener: false, name: "Area element with base target=_blank with implicit rel=noopener" },
+    { id: "area4", hasOpener: false, name: "Area element with base target=_blank with rel=opener+noopener" },
+    { id: "area5", hasOpener: false, name: "Area element with base target=_blank with rel=noopener+opener" },
+  ];
+
+  tests.forEach(data => {
+    async_test(
+      test => {
+        let bc = new BroadcastChannel(data.id);
+        bc.addEventListener("message", test.step_func_done(e => {
+          assert_equals(e.data.hasOpener, data.hasOpener);
+        }), {once: true});
+
+        document.getElementById(data.id).click();
+      }, data.name);
+  });
+  </script>
+</body>
+</html>
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/alternate-css-ref.html b/testing/web-platform/tests/html/semantics/links/linktypes/alternate-css-ref.html
new file mode 100644
index 0000000000..ec961eac15
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/alternate-css-ref.html
@@ -0,0 +1,5 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Reference of Alternate css</title>
+<link rel="stylesheet" href="preferred.css" title="preferred">
+<div>foobar</div>
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/alternate-css.html b/testing/web-platform/tests/html/semantics/links/linktypes/alternate-css.html
new file mode 100644
index 0000000000..366d6c5593
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/alternate-css.html
@@ -0,0 +1,7 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Alternate css</title>
+<link rel="match" href="alternate-css-ref.html">
+<link rel="stylesheet"           href="preferred.css" title="preferred">
+<link rel="alternate stylesheet" href="alternate.css" title="alternate">
+<div>foobar</div>
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/alternate-import.css b/testing/web-platform/tests/html/semantics/links/linktypes/alternate-import.css
new file mode 100644
index 0000000000..7db3df1d78
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/alternate-import.css
@@ -0,0 +1,3 @@
+body {
+    background-color: black;
+}
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/alternate.css b/testing/web-platform/tests/html/semantics/links/linktypes/alternate.css
new file mode 100644
index 0000000000..b101ab91f0
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/alternate.css
@@ -0,0 +1,5 @@
+@import url("alternate-import.css");
+
+div {
+    background-color: red;
+}
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-lower.css b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-lower.css
new file mode 100644
index 0000000000..a19c9dfd72
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-lower.css
@@ -0,0 +1 @@
+#z-lower:after { content: "PASS"; color: green; }
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-mixed.css b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-mixed.css
new file mode 100644
index 0000000000..7389ea1a1a
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-mixed.css
@@ -0,0 +1 @@
+#z-mixed:after { content: "PASS"; color: green; }
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-other.css b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-other.css
new file mode 100644
index 0000000000..a6c2616d86
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-other.css
@@ -0,0 +1 @@
+#z-other:after { content: "FAIL"; color: red; }
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-ref.html b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-ref.html
new file mode 100644
index 0000000000..5ac2432547
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive-ref.html
@@ -0,0 +1,9 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<style>
+p:after { font-weight: bold; }
+p:after { content: "PASS"; color: green; }
+</style>
+<p>text/css treated as CSS?
+<p>TeXt/CsS treated as CSS?
+<p>text/cſs ignored?
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive.css b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive.css
new file mode 100644
index 0000000000..5d647d0f2e
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive.css
@@ -0,0 +1,3 @@
+p:after { font-weight: bold; }
+p:after { content: "FAIL"; color: red; }
+#z-other:after { content: "PASS"; color: green; }
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive.html b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive.html
new file mode 100644
index 0000000000..39fd5520d2
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/link-type-stylesheet/process-stylesheet-linked-resource-ascii-case-insensitive.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="help" href="https://html.spec.whatwg.org/#link-type-stylesheet:process-the-linked-resource">
+<link rel="help" href="https://html.spec.whatwg.org/#content-type">
+<link rel="help" href="https://mimesniff.spec.whatwg.org/#mime-type-representation">
+<link rel="match" href="process-stylesheet-linked-resource-ascii-case-insensitive-ref.html">
+<meta name="assert" content="link@type values for stylesheet resources are ASCII case-insensitive">
+<link rel="stylesheet" href="process-stylesheet-linked-resource-ascii-case-insensitive.css">
+<link rel="stylesheet" href="process-stylesheet-linked-resource-ascii-case-insensitive-lower.css" type="text/css">
+<link rel="stylesheet" href="process-stylesheet-linked-resource-ascii-case-insensitive-mixed.css" type="TeXt/CsS">
+<link rel="stylesheet" href="process-stylesheet-linked-resource-ascii-case-insensitive-other.css" type="text/cſs">
+<p id="z-lower">text/css treated as CSS?
+<p id="z-mixed">TeXt/CsS treated as CSS?
+<p id="z-other">text/cſs ignored?
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/original-id.json b/testing/web-platform/tests/html/semantics/links/linktypes/original-id.json
new file mode 100644
index 0000000000..1e5f7b5ed3
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/original-id.json
@@ -0,0 +1 @@
+{"original_id":"linkTypes"}
\ No newline at end of file
diff --git a/testing/web-platform/tests/html/semantics/links/linktypes/preferred.css b/testing/web-platform/tests/html/semantics/links/linktypes/preferred.css
new file mode 100644
index 0000000000..54b95ac280
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/links/linktypes/preferred.css
@@ -0,0 +1,3 @@
+div {
+    border: 4px solid green;
+}
-- 
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