From fbaf0bb26397aa498eb9156f06d5a6fe34dd7dd8 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 03:14:29 +0200
Subject: Merging upstream version 125.0.1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../event-propagate-disabled.tentative.html        |   1 +
 .../resources/302-no-Location-header-text-css.asis |   4 +
 .../resources/stylesheet-bad-mime-type-empty.css   |   0
 .../stylesheet-bad-mime-type-empty.css.headers     |   1 +
 .../resources/stylesheet-bad-mime-type.css         |   3 +
 .../resources/stylesheet-bad-mime-type.css.headers |   1 +
 .../the-link-element/stylesheet-bad-mime-type.html |  27 ++
 .../the-link-element/stylesheet-non-OK-status.html |  17 +
 .../currentTime-move-within-document.html          |  31 ++
 .../iframe-loading-lazy-in-scroller-nested-2.html  |   2 +-
 ...ion_download_allow_downloads.sub.tentative.html |  52 ---
 ...wnload_allow_downloads.sub.tentative.https.html |  52 +++
 ...ow_open_download_allow_downloads.tentative.html |  29 --
 ...n_download_allow_downloads.tentative.https.html |  29 ++
 .../resources/sandbox-top-navigation-helper.js     |  76 ----
 .../resources/sandbox-top-navigation-helper.sub.js |  86 ++++
 ...tion-child-cross-origin.tentative.sub.window.js |  28 ++
 ...ion-child-special-cases.tentative.sub.window.js |  47 ---
 ...ox-top-navigation-child.tentative.sub.window.js |   2 +-
 ...p-navigation-cross-site.tentative.sub.window.js |  43 ++
 ...ion-escalate-privileges.tentative.sub.window.js |   2 +-
 ...p-navigation-grandchild.tentative.sub.window.js |   2 +-
 ...igation-user-activation.tentative.sub.window.js |  30 ++
 .../the-select-element/select-attribute-crash.html |  18 +
 ...button-and-datalist-invalidation.tentative.html |  23 ++
 ...select-child-button-and-datalist.tentative.html |   2 +-
 .../select-datalist-options-idl.tentative.html     |  81 ++++
 .../the-dialog-element/dialog-canceling.html       |   1 +
 .../the-dialog-element/dialog-open.html            |   4 +-
 .../the-summary-element/interactive-content.html   | 232 +++++++++++
 .../interestelement-interface.tentative.html       | 164 ++++++++
 .../invokeelement-interface.tentative.html         |  16 +-
 .../invokers/invokeevent-interface.tentative.html  |   6 +-
 ...voketarget-button-event-dispatch.tentative.html |   8 +-
 .../invoketarget-on-dialog-behavior.tentative.html | 455 +++++++++++++++++++++
 ...invoketarget-on-popover-behavior.tentative.html |  64 ++-
 .../semantics/invokers/resources/invoker-utils.js  |   8 +-
 .../permission-element/bounded-css-properties.html |  38 ++
 .../permission-element/invalid-css-properties.html |  34 ++
 .../negative-offset-and-margin.html                |  67 +++
 .../popover-shadow-dom-anchor.tentative.html       |  99 +++++
 .../semantics/popovers/popover-shadow-dom.html     |  94 +----
 .../popovers/popovertarget-reflection.html         |   8 +-
 .../semantics/popovers/resources/popover-utils.js  |   8 +-
 .../module/choice-of-error-1.html                  |   2 +-
 .../module/choice-of-error-2.html                  |   2 +-
 .../module/choice-of-error-3.html                  |   2 +-
 .../the-script-element/module/error-type-1.html    |   2 +-
 .../the-script-element/module/error-type-2.html    |   2 +-
 .../the-script-element/module/error-type-3.html    |   2 +-
 .../module/evaluation-error-1.html                 |   2 +-
 .../module/evaluation-error-2.html                 |   2 +-
 .../module/evaluation-error-3.html                 |   2 +-
 .../module/evaluation-error-4.html                 |   2 +-
 .../the-bdi-element/bdi-auto-dir-default.html      |   4 +-
 55 files changed, 1666 insertions(+), 353 deletions(-)
 create mode 100644 testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/302-no-Location-header-text-css.asis
 create mode 100644 testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type-empty.css
 create mode 100644 testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type-empty.css.headers
 create mode 100644 testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type.css
 create mode 100644 testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type.css.headers
 create mode 100644 testing/web-platform/tests/html/semantics/document-metadata/the-link-element/stylesheet-bad-mime-type.html
 create mode 100644 testing/web-platform/tests/html/semantics/document-metadata/the-link-element/stylesheet-non-OK-status.html
 create mode 100644 testing/web-platform/tests/html/semantics/embedded-content/media-elements/offsets-into-the-media-resource/currentTime-move-within-document.html
 delete mode 100644 testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html
 create mode 100644 testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.https.html
 delete mode 100644 testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_window_open_download_allow_downloads.tentative.html
 create mode 100644 testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_window_open_download_allow_downloads.tentative.https.html
 delete mode 100644 testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/resources/sandbox-top-navigation-helper.js
 create mode 100644 testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/resources/sandbox-top-navigation-helper.sub.js
 create mode 100644 testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child-cross-origin.tentative.sub.window.js
 delete mode 100644 testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child-special-cases.tentative.sub.window.js
 create mode 100644 testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-cross-site.tentative.sub.window.js
 create mode 100644 testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-user-activation.tentative.sub.window.js
 create mode 100644 testing/web-platform/tests/html/semantics/forms/the-select-element/select-attribute-crash.html
 create mode 100644 testing/web-platform/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist-invalidation.tentative.html
 create mode 100644 testing/web-platform/tests/html/semantics/forms/the-select-element/select-datalist-options-idl.tentative.html
 create mode 100644 testing/web-platform/tests/html/semantics/interactive-elements/the-summary-element/interactive-content.html
 create mode 100644 testing/web-platform/tests/html/semantics/invokers/interestelement-interface.tentative.html
 create mode 100644 testing/web-platform/tests/html/semantics/invokers/invoketarget-on-dialog-behavior.tentative.html
 create mode 100644 testing/web-platform/tests/html/semantics/permission-element/bounded-css-properties.html
 create mode 100644 testing/web-platform/tests/html/semantics/permission-element/invalid-css-properties.html
 create mode 100644 testing/web-platform/tests/html/semantics/permission-element/negative-offset-and-margin.html
 create mode 100644 testing/web-platform/tests/html/semantics/popovers/popover-shadow-dom-anchor.tentative.html

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

diff --git a/testing/web-platform/tests/html/semantics/disabled-elements/event-propagate-disabled.tentative.html b/testing/web-platform/tests/html/semantics/disabled-elements/event-propagate-disabled.tentative.html
index e3dcd43a17..2be6dc72fe 100644
--- a/testing/web-platform/tests/html/semantics/disabled-elements/event-propagate-disabled.tentative.html
+++ b/testing/web-platform/tests/html/semantics/disabled-elements/event-propagate-disabled.tentative.html
@@ -1,6 +1,7 @@
 <!DOCTYPE html>
 <meta charset="utf8">
 <meta name="timeout" content="long">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Event propagation on disabled form elements</title>
 <link rel="author" href="mailto:krosylight@mozilla.com">
 <link rel="help" href="https://github.com/whatwg/html/issues/2368">
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/302-no-Location-header-text-css.asis b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/302-no-Location-header-text-css.asis
new file mode 100644
index 0000000000..ddf4898d3f
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/302-no-Location-header-text-css.asis
@@ -0,0 +1,4 @@
+HTTP/1.1 302 Found
+Content-Type: text/css
+
+body { background-color: red; }
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type-empty.css b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type-empty.css
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type-empty.css.headers b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type-empty.css.headers
new file mode 100644
index 0000000000..156209f9c8
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type-empty.css.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type.css b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type.css
new file mode 100644
index 0000000000..e1b2552ffe
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type.css
@@ -0,0 +1,3 @@
+body {
+    background-color: green;
+}
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type.css.headers b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type.css.headers
new file mode 100644
index 0000000000..156209f9c8
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/resources/stylesheet-bad-mime-type.css.headers
@@ -0,0 +1 @@
+Content-Type: text/html
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/stylesheet-bad-mime-type.html b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/stylesheet-bad-mime-type.html
new file mode 100644
index 0000000000..08176d6cd2
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/stylesheet-bad-mime-type.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>stylesheets served with bad MIME types</title>
+<link rel="author" title="Michael[tm] Smith" href="mailto:mike@w3.org">
+<link rel="help" href="https://html.spec.whatwg.org/#link-type-stylesheet:process-the-linked-resource">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+  async_test((t) => {
+    const link = document.createElement("link");
+    link.rel = "stylesheet";
+    link.href = "resources/stylesheet-bad-mime-type.css";
+    link.onload = t.unreached_func();
+    link.onerror = t.step_func_done();
+    document.head.append(link);
+  }, "'load' event does not fire at link@rel=stylesheet having non-empty resource with bad MIME type");
+  async_test((t) => {
+    t.step_timeout(() => {
+      const link = document.createElement("link");
+      link.rel = "stylesheet";
+      link.href = "resources/stylesheet-bad-mime-type-empty.css";
+      link.onload = t.unreached_func();
+      link.onerror = t.step_func_done();
+      document.head.append(link);
+    }, 2000);
+  }, "'load' event does not fire at link@rel=stylesheet having empty resource with bad MIME type");
+</script>
diff --git a/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/stylesheet-non-OK-status.html b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/stylesheet-non-OK-status.html
new file mode 100644
index 0000000000..28ac55ff1a
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/document-metadata/the-link-element/stylesheet-non-OK-status.html
@@ -0,0 +1,17 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>stylesheet served with non-OK status</title>
+<link rel="author" title="Michael[tm] Smith" href="mailto:mike@w3.org">
+<link rel="help" href="https://html.spec.whatwg.org/#fetching-and-processing-a-resource-from-a-link-element:processresponseconsumebody">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+  async_test((t) => {
+    const link = document.createElement("link");
+    link.rel = "stylesheet";
+    link.href = "resources/302-no-Location-header-text-css.asis";
+    link.onload = t.unreached_func();
+    link.onerror = t.step_func_done();
+    document.head.append(link);
+  }, "'load' event does not fire at link@rel=stylesheet having resource with non-OK response status");
+</script>
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/media-elements/offsets-into-the-media-resource/currentTime-move-within-document.html b/testing/web-platform/tests/html/semantics/embedded-content/media-elements/offsets-into-the-media-resource/currentTime-move-within-document.html
new file mode 100644
index 0000000000..22b579d720
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/media-elements/offsets-into-the-media-resource/currentTime-move-within-document.html
@@ -0,0 +1,31 @@
+<!doctype html>
+<title>playback should not reset when moving within a document</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/common/media.js"></script>
+<div id="log"></div>
+<video autoplay muted hidden></video>
+<div id="elsewhere"></div>
+<script>
+async_test(t => {
+  const v = document.querySelector('video');
+  v.src = getVideoURI('/media/movie_300');
+  v.currentTime  = 0;
+  v.onplaying = t.step_func(() => {
+    v.currentTime = 10;
+    t.step_timeout(() => {
+      assert_greater_than_equal(v.currentTime, 10);
+      document.getElementById('elsewhere').appendChild(v);
+      assert_false(v.paused, 'paused after moving');
+      assert_greater_than_equal(v.currentTime, 10);
+      t.step_timeout(() => {
+        assert_greater_than_equal(v.currentTime, 10);
+        t.done();
+      }, 0);
+    }, 0);
+
+  });
+  v.play();
+  v.onpause = t.step_func(function() { assert_unreached(); });
+});
+</script>
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-in-scroller-nested-2.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-in-scroller-nested-2.html
index d080831175..9eec621c89 100644
--- a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-in-scroller-nested-2.html
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe-loading-lazy-in-scroller-nested-2.html
@@ -31,7 +31,7 @@
 <div id=scroller2>
   <div id="spacer"></div>
   <div id="scroller">
-    <iframe>
+    <iframe
       id="target"
       src="resources/subframe.html"
       loading="lazy"
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html
deleted file mode 100644
index 6b3b3104ef..0000000000
--- a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.html
+++ /dev/null
@@ -1,52 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>Navigation resulted download in sandbox is allowed by allow-downloads.</title>
-<meta name="timeout" content="long" />
-<link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-iframe-sandbox">
-<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-iframe-element">
-<script src="/resources/testharness.js"></script>
-<script src='/resources/testharnessreport.js'></script>
-<script src="support/iframe_sandbox_download_helper.js"></script>
-<body>
-<script>
-"use strict";
-
-async_test(t => {
-    const token = "{{$id:uuid()}}";
-    var iframe = document.createElement("iframe");
-    iframe.srcdoc = "<a>Download</a>";
-    iframe.sandbox = "allow-same-origin allow-downloads";
-    iframe.onload = t.step_func(function () {
-        iframe.contentWindow.addEventListener(
-            "unload", t.unreached_func("Unexpected navigation."));
-        var anchor = iframe.contentDocument.getElementsByTagName('a')[0];
-        // Set |finish-delay| to let the server stream a response over a  period
-        // of time, so it's able to catch potential download cancellation by
-        // detecting a socket close.
-        anchor.href = "support/download_stash.py?token=" + token + "&finish-delay=" + StreamDownloadFinishDelay();
-        anchor.click();
-        AssertDownloadSuccess(t, token, StreamDownloadFinishDelay() + DownloadVerifyDelay());
-    });
-
-    document.body.appendChild(iframe);
-}, "Navigation resulted download in sandbox is allowed by allow-downloads.");
-
-async_test(t => {
-    const token = "{{$id:uuid()}}";
-    var iframe = document.createElement("iframe");
-
-    const folder = location.origin+"/html/semantics/embedded-content/the-iframe-element/";
-    const href = `${folder}support/download_stash.py?token=${token}&finish-delay=${StreamDownloadFinishDelay() }`;
-    const objectDoc =`<a href="${href}">download</a>
-    <${"script"}> document.querySelector("a").click(); </${"script"}>`;
-
-    iframe.srcdoc = `<object data='data:text/html,${objectDoc}'></object>`;
-    iframe.sandbox = "allow-same-origin  allow-scripts allow-downloads";
-    iframe.addEventListener("load",()=>{
-        AssertDownloadSuccess(t, token, StreamDownloadFinishDelay() + DownloadVerifyDelay());
-    })
-    document.body.appendChild(iframe);
-}, "Navigation resulted download in sandbox from <object> is allowed by allow-downloads.");
-
-</script>
-</body>
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.https.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.https.html
new file mode 100644
index 0000000000..6b3b3104ef
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads.sub.tentative.https.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Navigation resulted download in sandbox is allowed by allow-downloads.</title>
+<meta name="timeout" content="long" />
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-iframe-sandbox">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-iframe-element">
+<script src="/resources/testharness.js"></script>
+<script src='/resources/testharnessreport.js'></script>
+<script src="support/iframe_sandbox_download_helper.js"></script>
+<body>
+<script>
+"use strict";
+
+async_test(t => {
+    const token = "{{$id:uuid()}}";
+    var iframe = document.createElement("iframe");
+    iframe.srcdoc = "<a>Download</a>";
+    iframe.sandbox = "allow-same-origin allow-downloads";
+    iframe.onload = t.step_func(function () {
+        iframe.contentWindow.addEventListener(
+            "unload", t.unreached_func("Unexpected navigation."));
+        var anchor = iframe.contentDocument.getElementsByTagName('a')[0];
+        // Set |finish-delay| to let the server stream a response over a  period
+        // of time, so it's able to catch potential download cancellation by
+        // detecting a socket close.
+        anchor.href = "support/download_stash.py?token=" + token + "&finish-delay=" + StreamDownloadFinishDelay();
+        anchor.click();
+        AssertDownloadSuccess(t, token, StreamDownloadFinishDelay() + DownloadVerifyDelay());
+    });
+
+    document.body.appendChild(iframe);
+}, "Navigation resulted download in sandbox is allowed by allow-downloads.");
+
+async_test(t => {
+    const token = "{{$id:uuid()}}";
+    var iframe = document.createElement("iframe");
+
+    const folder = location.origin+"/html/semantics/embedded-content/the-iframe-element/";
+    const href = `${folder}support/download_stash.py?token=${token}&finish-delay=${StreamDownloadFinishDelay() }`;
+    const objectDoc =`<a href="${href}">download</a>
+    <${"script"}> document.querySelector("a").click(); </${"script"}>`;
+
+    iframe.srcdoc = `<object data='data:text/html,${objectDoc}'></object>`;
+    iframe.sandbox = "allow-same-origin  allow-scripts allow-downloads";
+    iframe.addEventListener("load",()=>{
+        AssertDownloadSuccess(t, token, StreamDownloadFinishDelay() + DownloadVerifyDelay());
+    })
+    document.body.appendChild(iframe);
+}, "Navigation resulted download in sandbox from <object> is allowed by allow-downloads.");
+
+</script>
+</body>
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_window_open_download_allow_downloads.tentative.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_window_open_download_allow_downloads.tentative.html
deleted file mode 100644
index 158fc4f947..0000000000
--- a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_window_open_download_allow_downloads.tentative.html
+++ /dev/null
@@ -1,29 +0,0 @@
-<!DOCTYPE html>
-<meta charset="utf-8">
-<title>Downloads triggered by window.open from sandbox are blocked.</title>
-<link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-iframe-sandbox">
-<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-iframe-element">
-<script src="/common/utils.js"></script>
-<script src="/resources/testharness.js"></script>
-<script src='/resources/testharnessreport.js'></script>
-<script src="support/iframe_sandbox_download_helper.js"></script>
-<body>
-<script>
-"use strict";
-
-['', '"_blank"', '"_blank", "noopener"'].forEach(options =>
-  async_test(t => {
-    const download_token = token();
-    let iframe = document.createElement("iframe");
-    const download_link = `support/download_stash.py?token=${download_token}` +
-          `&finish-delay=${StreamDownloadFinishDelay()}`;
-    iframe.srcdoc = `<script>window.open("${download_link}", ${options})</scr` +
-      `ipt>`;
-    iframe.sandbox = "allow-same-origin allow-popups allow-scripts " +
-      "allow-downloads";
-    AssertDownloadSuccess(t, download_token, DownloadVerifyDelay());
-    document.body.appendChild(iframe);
-  }, `window.open(download, ${options}) triggering download in ` +
-             'sandbox is allowed by allow-downloads.'));
-</script>
-</body>
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_window_open_download_allow_downloads.tentative.https.html b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_window_open_download_allow_downloads.tentative.https.html
new file mode 100644
index 0000000000..158fc4f947
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_window_open_download_allow_downloads.tentative.https.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Downloads triggered by window.open from sandbox are blocked.</title>
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#attr-iframe-sandbox">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#the-iframe-element">
+<script src="/common/utils.js"></script>
+<script src="/resources/testharness.js"></script>
+<script src='/resources/testharnessreport.js'></script>
+<script src="support/iframe_sandbox_download_helper.js"></script>
+<body>
+<script>
+"use strict";
+
+['', '"_blank"', '"_blank", "noopener"'].forEach(options =>
+  async_test(t => {
+    const download_token = token();
+    let iframe = document.createElement("iframe");
+    const download_link = `support/download_stash.py?token=${download_token}` +
+          `&finish-delay=${StreamDownloadFinishDelay()}`;
+    iframe.srcdoc = `<script>window.open("${download_link}", ${options})</scr` +
+      `ipt>`;
+    iframe.sandbox = "allow-same-origin allow-popups allow-scripts " +
+      "allow-downloads";
+    AssertDownloadSuccess(t, download_token, DownloadVerifyDelay());
+    document.body.appendChild(iframe);
+  }, `window.open(download, ${options}) triggering download in ` +
+             'sandbox is allowed by allow-downloads.'));
+</script>
+</body>
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/resources/sandbox-top-navigation-helper.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/resources/sandbox-top-navigation-helper.js
deleted file mode 100644
index 413f392dfc..0000000000
--- a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/resources/sandbox-top-navigation-helper.js
+++ /dev/null
@@ -1,76 +0,0 @@
-// To use this file, use the following imports:
-// // META: script=/common/dispatcher/dispatcher.js
-// // META: script=/common/get-host-info.sub.js
-// // META: script=/common/utils.js
-// // META: script=/resources/testdriver.js
-// // META: script=/resources/testdriver-vendor.js
-// // META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
-// // META: script=./resources/sandbox-top-navigation-helper.js
-
-// Helper file that provides various functions to test top-level navigation
-// with various frame and sandbox flag configurations.
-
-async function createNestedIframe(parent, origin, frame_sandbox, header_sandbox)
-{
-  let headers = [];
-  if (header_sandbox) {
-    headers.push([
-      "Content-Security-Policy",
-      "sandbox allow-scripts " + header_sandbox
-    ]);
-  }
-  let iframe_attributes = {};
-  if (frame_sandbox) {
-    iframe_attributes.sandbox = "allow-scripts " + frame_sandbox;
-  }
-  return parent.addIframe({
-    origin: origin,
-    scripts: [
-      '/resources/testdriver.js',
-      '/resources/testdriver-driver.js',
-      '/resources/testdriver-vendor.js'
-    ],
-    headers: headers,
-  }, iframe_attributes);
-}
-
-async function attemptTopNavigation(iframe, should_succeed) {
-  let did_succeed;
-  try {
-    await iframe.executeScript(() => {
-      window.top.location.href = "https://google.com";
-    });
-    did_succeed = true;
-  } catch (e) {
-    did_succeed = false;
-  }
-
-  assert_equals(did_succeed, should_succeed,
-      should_succeed ?
-          "The navigation should succeed." :
-          "The navigation should fail.");
-}
-
-async function setupTest() {
-  const rcHelper = new RemoteContextHelper();
-  return rcHelper.addWindow(/*config=*/ null, /*options=*/ {});
-}
-
-async function activate(iframe) {
-  return iframe.executeScript(async () => {
-    let b = document.createElement("button");
-    document.body.appendChild(b);
-
-    // Since test_driver.bless() does not play nicely with the remote context
-    // helper, this is a workaround to trigger user activation in the iframe.
-    // This adds a button to the iframe and then simulates hitting the 'tab' key
-    // twice. Once to focus on the button, and once to trigger user activation
-    // in the iframe (user activation is given to the frame that has focus when
-    // the tab key is pressed, not the frame that ends up getting focus). Note
-    // that this will result in both the parent and this frame getting user
-    // activation. Note that this currently only works for iframes nested 1
-    // level deep.
-    test_driver.set_test_context(window.top);
-    return test_driver.send_keys(document.body, "\uE004\uE004");
-  });
-}
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/resources/sandbox-top-navigation-helper.sub.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/resources/sandbox-top-navigation-helper.sub.js
new file mode 100644
index 0000000000..bec8f6a64a
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/resources/sandbox-top-navigation-helper.sub.js
@@ -0,0 +1,86 @@
+// To use this file, use the following imports:
+// // META: script=/common/dispatcher/dispatcher.js
+// // META: script=/common/get-host-info.sub.js
+// // META: script=/common/utils.js
+// // META: script=/resources/testdriver.js
+// // META: script=/resources/testdriver-vendor.js
+// // META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
+// // META: script=./resources/sandbox-top-navigation-helper.sub.js
+
+// Helper file that provides various functions to test top-level navigation
+// with various frame and sandbox flag configurations.
+
+async function createNestedIframe(parent, origin, frame_sandbox, header_sandbox)
+{
+  let headers = [];
+  if (header_sandbox) {
+    headers.push([
+      "Content-Security-Policy",
+      "sandbox allow-scripts " + header_sandbox
+    ]);
+  }
+  let iframe_attributes = {};
+  if (frame_sandbox) {
+    iframe_attributes.sandbox = "allow-scripts " + frame_sandbox;
+  }
+  return parent.addIframe({
+    origin: origin,
+    scripts: [
+      '/resources/testdriver.js',
+      '/resources/testdriver-vendor.js',
+    ],
+    headers: headers,
+  }, iframe_attributes);
+}
+
+async function navigateFrameTo(frame, origin) {
+  return frame.navigateToNew({
+    origin: origin,
+    scripts: [
+      '/resources/testdriver.js',
+      '/resources/testdriver-vendor.js',
+    ],
+  });
+}
+
+async function attemptTopNavigation(iframe, should_succeed) {
+  let did_succeed;
+  try {
+    await iframe.executeScript(() => {
+      window.top.location.href =
+          'http://{{hosts[alt][www2]}}:{{ports[http][0]}}';
+    });
+    did_succeed = true;
+  } catch (e) {
+    did_succeed = false;
+  }
+
+  assert_equals(did_succeed, should_succeed,
+      should_succeed ?
+          "The navigation should succeed." :
+          "The navigation should fail.");
+}
+
+async function setupTest() {
+  const rcHelper = new RemoteContextHelper();
+  return rcHelper.addWindow(/*config=*/ null, /*options=*/ {});
+}
+
+async function activate(iframe) {
+  return iframe.executeScript(async () => {
+    let b = document.createElement("button");
+    document.body.appendChild(b);
+
+    // Since test_driver.bless() does not play nicely with the remote context
+    // helper, this is a workaround to trigger user activation in the iframe.
+    // This adds a button to the iframe and then simulates hitting the 'tab' key
+    // twice. Once to focus on the button, and once to trigger user activation
+    // in the iframe (user activation is given to the frame that has focus when
+    // the tab key is pressed, not the frame that ends up getting focus). Note
+    // that this will result in both the parent and this frame getting user
+    // activation. Note that this currently only works for iframes nested 1
+    // level deep.
+    test_driver.set_test_context(window.top);
+    return test_driver.send_keys(document.body, "\uE004\uE004");
+  });
+}
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child-cross-origin.tentative.sub.window.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child-cross-origin.tentative.sub.window.js
new file mode 100644
index 0000000000..95d53e1fe3
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child-cross-origin.tentative.sub.window.js
@@ -0,0 +1,28 @@
+// META: title=Top-level navigation tests with cross origin & user activated child frames
+// META: script=/common/dispatcher/dispatcher.js
+// META: script=/common/get-host-info.sub.js
+// META: script=/common/utils.js
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-vendor.js
+// META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
+// META: script=./resources/sandbox-top-navigation-helper.sub.js
+
+'use strict';
+
+// /* ---------------------- CROSS ORIGIN (A -> B) TESTS ---------------------- */
+
+promise_test(async t => {
+  const main = await setupTest();
+  const iframe_1 = await createNestedIframe(main,
+      "HTTP_REMOTE_ORIGIN", "allow-top-navigation", "");
+
+  await attemptTopNavigation(iframe_1, true);
+}, "A cross-origin frame with frame sandbox flags can navigate top");
+
+promise_test(async t => {
+  const main = await setupTest();
+  const iframe_1 = await createNestedIframe(main,
+      "HTTP_REMOTE_ORIGIN", "", "allow-top-navigation");
+
+  await attemptTopNavigation(iframe_1, false);
+}, "A cross-origin frame with delivered sandbox flags can not navigate top");
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child-special-cases.tentative.sub.window.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child-special-cases.tentative.sub.window.js
deleted file mode 100644
index 8681411dd7..0000000000
--- a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child-special-cases.tentative.sub.window.js
+++ /dev/null
@@ -1,47 +0,0 @@
-// META: title=Top-level navigation tests with cross origin & user activated child frames
-// META: script=/common/dispatcher/dispatcher.js
-// META: script=/common/get-host-info.sub.js
-// META: script=/common/utils.js
-// META: script=/resources/testdriver.js
-// META: script=/resources/testdriver-vendor.js
-// META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
-// META: script=./resources/sandbox-top-navigation-helper.js
-
-'use strict';
-
-/* ------------------------- USER ACTIVATION TESTS ------------------------- */
-
-promise_test(async t => {
-  const main = await setupTest();
-  const iframe_1 = await createNestedIframe(main,
-      "HTTP_ORIGIN", "allow-top-navigation-by-user-activation", "");
-  await activate(iframe_1);
-
-  await attemptTopNavigation(iframe_1, true);
-}, "Allow top with user activation + user activation");
-
-promise_test(async t => {
-  const main = await setupTest();
-  const iframe_1 = await createNestedIframe(main,
-      "HTTP_ORIGIN", "allow-top-navigation-by-user-activation", "");
-
-  await attemptTopNavigation(iframe_1, false);
-}, "allow-top-navigation-by-user-activation set but no sticky activation");
-
-/* ---------------------- CROSS ORIGIN (A -> B) TESTS ---------------------- */
-
-promise_test(async t => {
-  const main = await setupTest();
-  const iframe_1 = await createNestedIframe(main,
-      "HTTP_REMOTE_ORIGIN", "allow-top-navigation", "");
-
-  await attemptTopNavigation(iframe_1, true);
-}, "A cross-origin frame with frame sandbox flags can navigate top");
-
-promise_test(async t => {
-  const main = await setupTest();
-  const iframe_1 = await createNestedIframe(main,
-      "HTTP_REMOTE_ORIGIN", "", "allow-top-navigation");
-
-  await attemptTopNavigation(iframe_1, false);
-}, "A cross-origin frame with delivered sandbox flags can not navigate top");
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child.tentative.sub.window.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child.tentative.sub.window.js
index 53faa99a40..1d5ea93830 100644
--- a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child.tentative.sub.window.js
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-child.tentative.sub.window.js
@@ -5,7 +5,7 @@
 // META: script=/resources/testdriver.js
 // META: script=/resources/testdriver-vendor.js
 // META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
-// META: script=./resources/sandbox-top-navigation-helper.js
+// META: script=./resources/sandbox-top-navigation-helper.sub.js
 
 'use strict';
 
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-cross-site.tentative.sub.window.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-cross-site.tentative.sub.window.js
new file mode 100644
index 0000000000..26db4eeaca
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-cross-site.tentative.sub.window.js
@@ -0,0 +1,43 @@
+// META: title=Top-level navigation tests with cross origin & user activated child frames
+// META: script=/common/dispatcher/dispatcher.js
+// META: script=/common/get-host-info.sub.js
+// META: script=/common/utils.js
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-actions.js
+// META: script=/resources/testdriver-vendor.js
+// META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
+// META: script=./resources/sandbox-top-navigation-helper.sub.js
+
+'use strict';
+
+promise_test(async t => {
+  const main = await setupTest();
+
+  const iframe = await createNestedIframe(main, "HTTP_ORIGIN", "", "");
+  await activate(iframe);
+
+  const new_iframe = await navigateFrameTo(iframe, "HTTPS_REMOTE_ORIGIN");
+  await attemptTopNavigation(new_iframe, false);
+}, "A cross-site unsandboxed iframe navigation consumes user activation and " +
+   "disallows top-level navigation.");
+
+promise_test(async t => {
+  const main = await setupTest();
+
+  const iframe = await createNestedIframe(main, "HTTP_ORIGIN", "", "");
+  await activate(iframe);
+
+  const new_iframe = await navigateFrameTo(iframe, "HTTP_REMOTE_ORIGIN");
+  await attemptTopNavigation(new_iframe, true);
+}, "A same-site unsandboxed iframe navigation does not consume user " +
+   "activation and allows top-level navigation.");
+
+promise_test(async t => {
+  const main = await setupTest();
+
+  const iframe = await createNestedIframe(main, "HTTP_ORIGIN", "", "");
+
+  const new_iframe = await navigateFrameTo(iframe, "HTTP_REMOTE_ORIGIN");
+  await attemptTopNavigation(new_iframe, false);
+}, "A same-site unsandboxed iframe navigation without sticky user activation " +
+   "does not allow top-level navigation.");
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-escalate-privileges.tentative.sub.window.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-escalate-privileges.tentative.sub.window.js
index a5cda9b0b9..2ea0ba606e 100644
--- a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-escalate-privileges.tentative.sub.window.js
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-escalate-privileges.tentative.sub.window.js
@@ -5,7 +5,7 @@
 // META: script=/resources/testdriver.js
 // META: script=/resources/testdriver-vendor.js
 // META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
-// META: script=./resources/sandbox-top-navigation-helper.js
+// META: script=./resources/sandbox-top-navigation-helper.sub.js
 
 'use strict';
 
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-grandchild.tentative.sub.window.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-grandchild.tentative.sub.window.js
index a07148f802..326c1dd54a 100644
--- a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-grandchild.tentative.sub.window.js
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-grandchild.tentative.sub.window.js
@@ -5,7 +5,7 @@
 // META: script=/resources/testdriver.js
 // META: script=/resources/testdriver-vendor.js
 // META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
-// META: script=./resources/sandbox-top-navigation-helper.js
+// META: script=./resources/sandbox-top-navigation-helper.sub.js
 
 'use strict';
 
diff --git a/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-user-activation.tentative.sub.window.js b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-user-activation.tentative.sub.window.js
new file mode 100644
index 0000000000..5079c8ad14
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/embedded-content/the-iframe-element/sandbox-top-navigation-user-activation.tentative.sub.window.js
@@ -0,0 +1,30 @@
+// META: title=Top-level navigation tests with cross origin & user activated child frames
+// META: script=/common/dispatcher/dispatcher.js
+// META: script=/common/get-host-info.sub.js
+// META: script=/common/utils.js
+// META: script=/resources/testdriver.js
+// META: script=/resources/testdriver-actions.js
+// META: script=/resources/testdriver-vendor.js
+// META: script=/html/browsers/browsing-the-web/remote-context-helper/resources/remote-context-helper.js
+// META: script=./resources/sandbox-top-navigation-helper.sub.js
+
+'use strict';
+
+/* ------------------------- USER ACTIVATION TESTS ------------------------- */
+
+promise_test(async t => {
+  const main = await setupTest();
+  const iframe_1 = await createNestedIframe(main,
+      "HTTP_ORIGIN", "allow-top-navigation-by-user-activation", "");
+  await activate(iframe_1);
+
+  await attemptTopNavigation(iframe_1, true);
+}, "Allow top with user activation + user activation");
+
+promise_test(async t => {
+  const main = await setupTest();
+  const iframe_1 = await createNestedIframe(main,
+      "HTTP_ORIGIN", "allow-top-navigation-by-user-activation", "");
+
+  await attemptTopNavigation(iframe_1, false);
+}, "allow-top-navigation-by-user-activation set but no sticky activation");
diff --git a/testing/web-platform/tests/html/semantics/forms/the-select-element/select-attribute-crash.html b/testing/web-platform/tests/html/semantics/forms/the-select-element/select-attribute-crash.html
new file mode 100644
index 0000000000..5330411a5d
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/the-select-element/select-attribute-crash.html
@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html class=test-wait>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://issues.chromium.org/324325525">
+
+<!-- Attempting to slot a child of <select> after initial slot assignment should not crash. -->
+
+<select size=1>
+  <optgroup></optgroup>
+</select>
+<script>
+requestAnimationFrame(() => {
+  document.querySelector('optgroup').setAttribute('slot', 'slot1');
+  requestAnimationFrame(() => {
+    document.documentElement.classList.remove('test-wait');
+  });
+});
+</script>
diff --git a/testing/web-platform/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist-invalidation.tentative.html b/testing/web-platform/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist-invalidation.tentative.html
new file mode 100644
index 0000000000..f71c1e52fc
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist-invalidation.tentative.html
@@ -0,0 +1,23 @@
+<!DOCTYPE html>
+<html class=reftest-wait>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/issues/9799">
+<link rel=match href="select-child-button-and-datalist-ref.html">
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<select>
+  <button type=popover>button</button>
+  <datalist>
+    <option>one</option>
+    <option>two</option>
+  </datalist>
+</select>
+
+<script>
+requestAnimationFrame(() => {
+  document.querySelector('select').style = 'appearance:bikeshed';
+  document.querySelector('button').click();
+  document.documentElement.classList.remove('reftest-wait');
+});
+</script>
diff --git a/testing/web-platform/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html b/testing/web-platform/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html
index b74957feed..54785ace95 100644
--- a/testing/web-platform/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html
+++ b/testing/web-platform/tests/html/semantics/forms/the-select-element/select-child-button-and-datalist.tentative.html
@@ -5,7 +5,7 @@
 <script src="/resources/testdriver.js"></script>
 <script src="/resources/testdriver-vendor.js"></script>
 
-<select>
+<select style="appearance:bikeshed">
   <button type=popover>button</button>
   <datalist>
     <option>one</option>
diff --git a/testing/web-platform/tests/html/semantics/forms/the-select-element/select-datalist-options-idl.tentative.html b/testing/web-platform/tests/html/semantics/forms/the-select-element/select-datalist-options-idl.tentative.html
new file mode 100644
index 0000000000..993f6e126c
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/forms/the-select-element/select-datalist-options-idl.tentative.html
@@ -0,0 +1,81 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/whatwg/html/issues/9799">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<select>
+  <datalist>
+    <option class=one>one</option>
+    <div>
+      <option class=two>two</option>
+    </div>
+    <option class=three>three</option>
+  </datalist>
+</select>
+
+<script>
+const select = document.querySelector('select');
+
+function runTest() {
+  const datalist = select.querySelector('datalist');
+  const firstOption = select.querySelector('option.one');
+  const secondOption = select.querySelector('option.two');
+  const thirdOption = select.querySelector('option.three');
+  const datalistChildDiv = datalist.querySelector('div');
+
+  let selectChildDiv = document.querySelector('select > div');
+  if (!selectChildDiv) {
+    selectChildDiv = document.createElement('div');
+    select.appendChild(selectChildDiv);
+  }
+
+  assert_equals(select.length, 3, 'select.length');
+  assert_equals(select.options.length, 3, 'select.options.length');
+  assert_equals(select.options[0], firstOption, 'select.options[0]');
+  assert_equals(select.options[1], secondOption, 'select.options[1]');
+  assert_equals(select.options[2], thirdOption, 'select.options[2]');
+
+  assert_equals(select.value, 'one', 'initial select.value');
+  select.value = 'two';
+  assert_equals(select.value, 'two', 'select.value after modifying');
+
+  secondOption.remove();
+  assert_equals(select.length, 2, 'select.length after removing an option');
+  assert_equals(select.options.length, 2, 'select.options.length after removing an option');
+  assert_equals(select.options[0], firstOption, 'select.options[0] after removing an option');
+  assert_equals(select.options[1], thirdOption, 'select.options[1] after removing an option');
+
+  datalist.appendChild(secondOption);
+  assert_equals(select.length, 3, 'select.length after re-adding an option');
+  assert_equals(select.options.length, 3, 'select.options.length after re-adding an option');
+  assert_equals(select.options[0], firstOption, 'select.options[0] after re-adding an option');
+  assert_equals(select.options[1], thirdOption, 'select.options[1] after re-adding an option');
+  assert_equals(select.options[2], secondOption, 'select.options[2] after re-adding an option');
+
+  selectChildDiv.appendChild(secondOption);
+  assert_equals(select.length, 2, 'select.length after moving option to child div');
+  assert_equals(select.options.length, 2, 'select.options.length after moving option to child div');
+  assert_equals(select.options[0], firstOption, 'select.options[0] after moving option to child div');
+  assert_equals(select.options[1], thirdOption, 'select.options[1] after moving option to child div');
+
+  // reset back to normal for the next test
+  datalistChildDiv.appendChild(secondOption);
+  select.value = 'one';
+}
+
+test(() => {
+  runTest();
+}, 'Option elements should work if they are a descendant of a selects datalist.');
+
+test(() => {
+  select.setAttribute('multiple', '');
+  runTest();
+}, 'Options in datalist should still work when the multiple attribute is added.');
+
+test(() => {
+  select.innerHTML = select.innerHTML;
+  select.value = 'one';
+  runTest();
+}, 'Options in datalist in multiple should work after re-parsing and re-attaching.');
+</script>
diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-canceling.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-canceling.html
index e368bde6fb..db757861e7 100644
--- a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-canceling.html
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-canceling.html
@@ -66,6 +66,7 @@ promise_test(async () => {
     event.preventDefault();
   });
 
+  await test_driver.bless();
   bottomDialog.showModal();
   await blessTopLayer(bottomDialog);
   topDialog.showModal();
diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-open.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-open.html
index e1f4c6ab82..bcd6ebebc1 100644
--- a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-open.html
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-open.html
@@ -37,7 +37,9 @@
 
     // close event is async, give it a chance to be fired
     t.step_timeout(function() {
-      t.done();
+      requestAnimationFrame(() => {
+        t.done();
+      });
     }, 0);
   }, "On setting it to false, the close event should not be fired");
 </script>
diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-summary-element/interactive-content.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-summary-element/interactive-content.html
new file mode 100644
index 0000000000..94869dc9b6
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-summary-element/interactive-content.html
@@ -0,0 +1,232 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>summary element: interactive content</title>
+<link rel="author" title="Michael[tm] Smith" href="mailto:mike@w3.org">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/interactive-elements.html#the-summary-element">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+
+<details>
+  <summary id=summary>
+  <a id=a href="#">anchor element</a>
+  <svg style="width: 160px; height: 100px" viewBox="0 0 100 100">
+    <a href="#" id="svg_a"><text id="svg_text" x="50" y="90" text-anchor="middle">SVG anchor element</text></a>
+  </svg>
+  <svg style="width: 100px; height: 200px" viewBox="0 0 100 100">
+    <foreignObject x="0" y="60" width="100" height="200" text-anchor="middle">
+      <a xmlns="http://www.w3.org/1999/xhtml" href="#" id="svg_foreignObject_a">SVG foreignObject with HTML anchor element</a>
+    </foreignObject>
+  </svg>
+  <audio id="audio" controls src=/media/sound_5.mp3></audio>
+  <button id=button>button element</button>
+  <embed id=embed src="/images/blue.png" height="100" width="100">
+  <iframe id=iframe srcdoc="iframe element"></iframe>
+  <img id=img_usemap usemap src=/media/poster.png></img>
+  <img id=img src=/media/poster.png></img>
+  <input type="text" value="input@type=text" id="input_text">
+  <input type="search" value="input@type=search" id="input_search">
+  <input type="tel" value="input@type=tel" id="input_tel">
+  <input type="url" value="input@type=url" id="input_url">
+  <input type="email" value="input@type=email" id="input_email">
+  <input type="password" value="input@type=password" id="input_password">
+  <input type="button" value="input@type=button" id="input_button">
+  <input type="reset" id="input_reset">
+  <input type="submit" id="input_submit">
+  <input type="date" value="input@type=date" id="input_date">
+  <input type="month" value="input@type=month" id="input_month">
+  <input type="week" value="input@type=week" id="input_week">
+  <input type="time" id="input_time">
+  <input type="datetime-local" id="input_datetime-local">
+  <input type="color" id="input_color">
+  <input type="number" value="1337" id="input_number">
+  <input type="range" id="input_range">
+  <input type="checkbox" id="input_checkbox">
+  <input type="radio" id="input_radio" disabled>
+  <input type="file" id="input_file">
+  <input type="image" id="input_image" src=/media/poster.png>
+  <label id=label style="display: block">label element</label>
+  <textarea value="textarea" id="textarea">textarea element</textarea>
+  <video id="video" controls>
+    <source src="/media/test-1s.mp4" type="video/mp4">
+    <source src="/media/test-1s.webm" type="video/webm">
+  </video>
+  <div id="non-interactive">This is clickable summary text</div>
+  </summary>
+</details>
+
+<script>
+const details = document.querySelector("details");
+
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("non-interactive"));
+  assert_true(details.open)
+}, "Clicking on non-interactive child of a <summary> opens its <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("a"));
+  assert_false(details.open)
+}, "Clicking an <a> link doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("svg_a"));
+  assert_false(details.open)
+}, "Clicking an SVG <a> link doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("svg_foreignObject_a"));
+  assert_false(details.open)
+}, "Clicking an HTML <a> link in an SVG <foreignObject> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("audio"));
+  assert_false(details.open)
+}, "Clicking an <audio> element doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("button"));
+  assert_false(details.open)
+}, "Clicking a <button> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("embed"));
+  assert_false(details.open)
+}, "Clicking the content of an <embed> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("iframe"));
+  assert_false(details.open)
+}, "Clicking in an <iframe> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("img_usemap"));
+  assert_false(details.open)
+}, "Clicking an <img> with a 'usemap' attribute doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("img"));
+  assert_true(details.open)
+}, "Clicking an <img> without a 'usemap' attribute opens <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_button"));
+  assert_false(details.open)
+}, "Clicking an <input type=button> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_reset"));
+  assert_false(details.open)
+}, "Clicking an <input type=reset> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_submit"));
+  assert_false(details.open)
+}, "Clicking an <input type=submit> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_text"));
+  assert_false(details.open)
+}, "Clicking an <input type=text> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_search"));
+  assert_false(details.open)
+}, "Clicking an <input type=search> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_tel"));
+  assert_false(details.open)
+}, "Clicking an <input type=tel> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_url"));
+  assert_false(details.open)
+}, "Clicking an <input type=url> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_email"));
+  assert_false(details.open)
+}, "Clicking an <input type=email> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_password"));
+  assert_false(details.open)
+}, "Clicking an <input type=password> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_date"));
+  assert_false(details.open)
+}, "Clicking an <input type=date> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_month"));
+  assert_false(details.open)
+}, "Clicking an <input type=month> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_week"));
+  assert_false(details.open)
+}, "Clicking an <input type=week> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_time"));
+  assert_false(details.open)
+}, "Clicking an <input type=time> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_datetime-local"));
+  assert_false(details.open)
+}, "Clicking an <input type=datetime-local> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_number"));
+  assert_false(details.open)
+}, "Clicking an <input type=number> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_range"));
+  assert_false(details.open)
+}, "Clicking an <input type=range> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_color"));
+  assert_false(details.open)
+}, "Clicking an <input type=color> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_checkbox"));
+  assert_false(details.open)
+}, "Clicking an <input type=checkbox> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_radio"));
+  assert_false(details.open)
+}, "Clicking an <input type=radio> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_file"));
+  assert_false(details.open)
+}, "Clicking an <input type=file> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("input_image"));
+  assert_false(details.open)
+}, "Clicking an <input type=image> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("label"));
+  assert_false(details.open)
+}, "Clicking a <label> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("textarea"));
+  assert_false(details.open)
+}, "Clicking in a <textarea> doesn't open <details>");
+promise_test(async () => {
+  details.open = false;
+  await test_driver.click(document.getElementById("video"));
+  assert_false(details.open)
+}, "Clicking a <video> doesn't open <details>");
+</script>
diff --git a/testing/web-platform/tests/html/semantics/invokers/interestelement-interface.tentative.html b/testing/web-platform/tests/html/semantics/invokers/interestelement-interface.tentative.html
new file mode 100644
index 0000000000..dc119de833
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/invokers/interestelement-interface.tentative.html
@@ -0,0 +1,164 @@
+<!doctype html>
+<meta charset="utf-8" />
+<meta name="author" title="Luke Warlow" href="mailto:lwarlow@igalia.com" />
+<link rel="help" href="https://open-ui.org/components/interest-invokers.explainer/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<button id="buttonInvoker" interesttarget="interestee"></button>
+<a id="aInvoker" interesttarget="interestee"></a>
+<input type="button" id="inputInvoker" interesttarget="interestee" />
+<div id="interestee"></div>
+
+<script>
+  test(function () {
+    assert_equals(buttonInvoker.interestTargetElement, interestee);
+    assert_equals(aInvoker.interestTargetElement, interestee);
+    assert_equals(inputInvoker.interestTargetElement, interestee);
+  }, "interestTargetElement reflects interestee HTML element");
+
+  test(function () {
+    const div = document.body.appendChild(document.createElement("div"));
+    buttonInvoker.interestTargetElement = div;
+    aInvoker.interestTargetElement = div;
+    inputInvoker.interestTargetElement = div;
+    assert_equals(buttonInvoker.interestTargetElement, div);
+    assert_equals(buttonInvoker.getAttribute("interesttarget"), "");
+    assert_equals(aInvoker.interestTargetElement, div);
+    assert_equals(aInvoker.getAttribute("interesttarget"), "");
+    assert_equals(inputInvoker.interestTargetElement, div);
+    assert_equals(inputInvoker.getAttribute("interesttarget"), "");
+  }, "interestTargetElement reflects set value");
+
+  test(function () {
+    const host = document.body.appendChild(document.createElement("div"));
+    const shadow = host.attachShadow({ mode: "open" });
+    const button = shadow.appendChild(document.createElement("button"));
+    button.interestTargetElement = interestee;
+    assert_equals(button.interestTargetElement, interestee);
+    assert_equals(buttonInvoker.getAttribute("interesttarget"), "");
+  }, "interestTargetElement reflects set value across shadow root into light dom");
+
+  test(function () {
+    const host = document.body.appendChild(document.createElement("div"));
+    const shadow = host.attachShadow({ mode: "open" });
+    const div = shadow.appendChild(document.createElement("div"));
+    buttonInvoker.interestTargetElement = div;
+    assert_equals(buttonInvoker.interestTargetElement, null);
+    assert_equals(buttonInvoker.getAttribute("interesttarget"), "");
+  }, "interestTargetElement does not reflect set value inside shadowroot");
+
+  test(function () {
+    buttonInvoker.setAttribute('interesttarget', 'invalid');
+    assert_equals(buttonInvoker.interestTargetElement, null);
+    assert_equals(buttonInvoker.getAttribute("interesttarget"), "invalid");
+    aInvoker.setAttribute('interesttarget', 'invalid');
+    assert_equals(aInvoker.interestTargetElement, null);
+    assert_equals(aInvoker.getAttribute("interesttarget"), "invalid");
+    inputInvoker.setAttribute('interesttarget', 'invalid');
+    assert_equals(inputInvoker.interestTargetElement, null);
+    assert_equals(inputInvoker.getAttribute("interesttarget"), "invalid");
+  }, "interestTargetElement does not reflect invalid value");
+
+  test(function () {
+    assert_throws_js(
+      TypeError,
+      function () {
+        buttonInvoker.interestTargetElement = {};
+      },
+      "interestTargetElement attribute value must be an instance of Element",
+    );
+    assert_throws_js(
+      TypeError,
+      function () {
+        aInvoker.interestTargetElement = {};
+      },
+      "interestTargetElement attribute value must be an instance of Element",
+    );
+    assert_throws_js(
+      TypeError,
+      function () {
+        inputInvoker.interestTargetElement = {};
+      },
+      "interestTargetElement attribute value must be an instance of Element",
+    );
+  }, "interestTargetElement throws error on assignment of non Element");
+
+  test(function () {
+    assert_false(buttonInvoker.hasAttribute("interestaction"));
+    assert_equals(buttonInvoker.interestAction, "");
+    assert_false(aInvoker.hasAttribute("interestaction"));
+    assert_equals(aInvoker.interestAction, "");
+    assert_false(inputInvoker.hasAttribute("interestaction"));
+    assert_equals(inputInvoker.interestAction, "");
+  }, "interestAction reflects '' when attribute not present");
+
+  test(function () {
+    buttonInvoker.setAttribute("interestaction", "");
+    assert_equals(buttonInvoker.getAttribute("interestaction"), "");
+    assert_equals(buttonInvoker.interestAction, "");
+    aInvoker.setAttribute("interestaction", "");
+    assert_equals(aInvoker.getAttribute("interestaction"), "");
+    assert_equals(aInvoker.interestAction, "");
+    inputInvoker.setAttribute("interestaction", "");
+    assert_equals(inputInvoker.getAttribute("interestaction"), "");
+    assert_equals(inputInvoker.interestAction, "");
+  }, "interestAction reflects '' when attribute empty, setAttribute version");
+
+  test(function () {
+      buttonInvoker.interestAction = "";
+      assert_equals(buttonInvoker.getAttribute("interestaction"), "");
+      assert_equals(buttonInvoker.interestAction, "");
+      aInvoker.interestAction = "";
+      assert_equals(aInvoker.getAttribute("interestaction"), "");
+      assert_equals(aInvoker.interestAction, "");
+      inputInvoker.interestAction = "";
+      assert_equals(inputInvoker.getAttribute("interestaction"), "");
+      assert_equals(inputInvoker.interestAction, "");
+  }, "interestAction reflects '' when attribute empty, IDL setter version");
+
+  test(function () {
+      buttonInvoker.interestAction = "fooBarBaz";
+      assert_equals(buttonInvoker.getAttribute("interestaction"), "fooBarBaz");
+      assert_equals(buttonInvoker.interestAction, "fooBarBaz");
+      aInvoker.interestAction = "fooBarBaz";
+      assert_equals(aInvoker.getAttribute("interestaction"), "fooBarBaz");
+      assert_equals(aInvoker.interestAction, "fooBarBaz");
+      inputInvoker.interestAction = "fooBarBaz";
+      assert_equals(inputInvoker.getAttribute("interestaction"), "fooBarBaz");
+      assert_equals(inputInvoker.interestAction, "fooBarBaz");
+  }, "interestAction reflects same casing");
+
+  test(function () {
+      buttonInvoker.interestAction = [];
+      assert_equals(buttonInvoker.getAttribute("interestaction"), "");
+      assert_equals(buttonInvoker.interestAction, "");
+      aInvoker.interestAction = [];
+      assert_equals(aInvoker.getAttribute("interestaction"), "");
+      assert_equals(aInvoker.interestAction, "");
+      inputInvoker.interestAction = [];
+      assert_equals(inputInvoker.getAttribute("interestaction"), "");
+      assert_equals(inputInvoker.interestAction, "");
+  }, "interestAction reflects '' when attribute set to []");
+
+  test(function () {
+      buttonInvoker.interestAction = [1, 2, 3];
+      assert_equals(buttonInvoker.getAttribute("interestaction"), "1,2,3");
+      assert_equals(buttonInvoker.interestAction, "1,2,3");
+      aInvoker.interestAction = [1, 2, 3];
+      assert_equals(aInvoker.getAttribute("interestaction"), "1,2,3");
+      assert_equals(aInvoker.interestAction, "1,2,3");
+      inputInvoker.interestAction = [1, 2, 3];
+      assert_equals(inputInvoker.getAttribute("interestaction"), "1,2,3");
+      assert_equals(inputInvoker.interestAction, "1,2,3");
+  }, "interestAction reflects tostring value");
+
+  test(function () {
+      buttonInvoker.interestAction = {};
+      assert_equals(buttonInvoker.interestAction, "[object Object]");
+      aInvoker.interestAction = {};
+      assert_equals(aInvoker.interestAction, "[object Object]");
+      inputInvoker.interestAction = {};
+      assert_equals(inputInvoker.interestAction, "[object Object]");
+  }, "interestAction reflects tostring value 2");
+</script>
diff --git a/testing/web-platform/tests/html/semantics/invokers/invokeelement-interface.tentative.html b/testing/web-platform/tests/html/semantics/invokers/invokeelement-interface.tentative.html
index b003daf20d..5a2854fe31 100644
--- a/testing/web-platform/tests/html/semantics/invokers/invokeelement-interface.tentative.html
+++ b/testing/web-platform/tests/html/semantics/invokers/invokeelement-interface.tentative.html
@@ -53,14 +53,14 @@
 
   test(function () {
     assert_false(invoker.hasAttribute("invokeaction"));
-    assert_equals(invoker.invokeAction, "auto");
-  }, "invokeAction reflects 'auto' when attribute not present");
+    assert_equals(invoker.invokeAction, "");
+  }, "invokeAction reflects '' when attribute not present");
 
   test(function () {
     invoker.setAttribute("invokeaction", "");
     assert_equals(invoker.getAttribute("invokeaction"), "");
-    assert_equals(invoker.invokeAction, "auto");
-  }, "invokeAction reflects 'auto' when attribute empty");
+    assert_equals(invoker.invokeAction, "");
+  }, "invokeAction reflects '' when attribute empty, setAttribute version");
 
   test(function () {
     invoker.invokeAction = "fooBarBaz";
@@ -71,8 +71,8 @@
   test(function () {
     invoker.invokeAction = "";
     assert_equals(invoker.getAttribute("invokeaction"), "");
-    assert_equals(invoker.invokeAction, "auto");
-  }, "invokeAction reflects 'auto' when attribute empty 2");
+    assert_equals(invoker.invokeAction, "");
+  }, "invokeAction reflects '' when attribute empty, IDL version");
 
   test(function () {
     invoker.invokeAction = [1, 2, 3];
@@ -83,8 +83,8 @@
   test(function () {
     invoker.invokeAction = [];
     assert_equals(invoker.getAttribute("invokeaction"), "");
-    assert_equals(invoker.invokeAction, "auto");
-  }, "invokeAction reflects 'auto' when attribute set to []");
+    assert_equals(invoker.invokeAction, "");
+  }, "invokeAction reflects '' when attribute set to []");
 
   test(function () {
     invoker.invokeAction = {};
diff --git a/testing/web-platform/tests/html/semantics/invokers/invokeevent-interface.tentative.html b/testing/web-platform/tests/html/semantics/invokers/invokeevent-interface.tentative.html
index 82910b3d44..382f808071 100644
--- a/testing/web-platform/tests/html/semantics/invokers/invokeevent-interface.tentative.html
+++ b/testing/web-platform/tests/html/semantics/invokers/invokeevent-interface.tentative.html
@@ -15,9 +15,9 @@
 <script>
   test(function () {
     const event = new InvokeEvent("test");
-    assert_equals(event.action, "auto");
+    assert_equals(event.action, "");
     assert_readonly(event, "action", "readonly attribute value");
-  }, "action is a readonly defaulting to 'auto'");
+  }, "action is a readonly defaulting to ''");
 
   test(function () {
     const event = new InvokeEvent("test");
@@ -32,7 +32,7 @@
 
   test(function () {
     const event = new InvokeEvent("test", { action: undefined });
-    assert_equals(event.action, "auto");
+    assert_equals(event.action, "");
   }, "action set to undefined");
 
   test(function () {
diff --git a/testing/web-platform/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html b/testing/web-platform/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html
index b19c1d3adc..d8d9c04022 100644
--- a/testing/web-platform/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html
+++ b/testing/web-platform/tests/html/semantics/invokers/invoketarget-button-event-dispatch.tentative.html
@@ -22,7 +22,7 @@
     assert_equals(event.bubbles, false, "bubbles");
     assert_equals(event.composed, true, "composed");
     assert_equals(event.isTrusted, true, "isTrusted");
-    assert_equals(event.action, "auto", "action");
+    assert_equals(event.action, "", "action");
     assert_equals(event.target, invokee, "target");
     assert_equals(event.invoker, invokerbutton, "invoker");
   }, "event dispatches on click");
@@ -107,6 +107,7 @@
       "invoke",
       (event) => {
         eventInvoker = event.invoker;
+        eventTarget = event.target;
         called = true;
       },
       { once: true },
@@ -114,6 +115,7 @@
     invokerbutton.invokeTargetElement = svgInvokee;
     await clickOn(invokerbutton);
     assert_true(called, "event was called");
-    assert_true(eventInvoker == svgInvokee, "event invoker is set to right element");
-  }, "event dispatches if invoker is non-HTML Element");
+    assert_equals(eventInvoker, invokerbutton, "event.invoker is set to right element");
+    assert_equals(eventTarget, svgInvokee, "event.target is set to right element");
+  }, "event dispatches if invokee is non-HTML Element");
 </script>
diff --git a/testing/web-platform/tests/html/semantics/invokers/invoketarget-on-dialog-behavior.tentative.html b/testing/web-platform/tests/html/semantics/invokers/invoketarget-on-dialog-behavior.tentative.html
new file mode 100644
index 0000000000..774d308703
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/invokers/invoketarget-on-dialog-behavior.tentative.html
@@ -0,0 +1,455 @@
+<!doctype html>
+<meta charset="utf-8" />
+<meta name="author" title="Keith Cirkel" href="mailto:wpt@keithcirkel.co.uk" />
+<meta name="timeout" content="long">
+<link rel="help" href="https://open-ui.org/components/invokers.explainer/" />
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="resources/invoker-utils.js"></script>
+
+<dialog id="invokee">
+  <button id="containedinvoker" invoketarget="invokee"></button>
+</dialog>
+<button id="invokerbutton" invoketarget="invokee"></button>
+
+<script>
+  function resetState() {
+    invokee.close();
+    try { invokee.hidePopover(); } catch {}
+    invokee.removeAttribute("popover");
+    invokerbutton.removeAttribute("invokeaction");
+    containedinvoker.removeAttribute("invokeaction");
+  }
+
+  // opening a dialog
+
+  [null, "", "showmodal", /* test case sensitivity */ "sHoWmOdAl"].forEach(
+    (action) => {
+      ["property", "attribute"].forEach((setType) => {
+        promise_test(
+          async function (t) {
+            t.add_cleanup(resetState);
+            assert_false(invokee.open, "invokee.open");
+            assert_false(invokee.matches(":modal"), "invokee :modal");
+            if (typeof action === "string") {
+              if (setType === "property") {
+                invokerbutton.invokeaction = action;
+              } else {
+                invokerbutton.setAttribute("invokeaction", action);
+              }
+            }
+            await clickOn(invokerbutton);
+            assert_true(invokee.open, "invokee.open");
+            assert_true(invokee.matches(":modal"), "invokee :modal");
+          },
+          `invoking (with invokeaction ${setType} as ${
+            action == null ? "auto" : action || "explicit empty"
+          }) closed dialog opens as modal`,
+        );
+
+        promise_test(
+          async function (t) {
+            t.add_cleanup(resetState);
+            assert_false(invokee.open, "invokee.open");
+            assert_false(invokee.matches(":modal"), "invokee :modal");
+            invokee.addEventListener("invoke", (e) => e.preventDefault(), {
+              once: true,
+            });
+            if (typeof action === "string") {
+              if (setType === "property") {
+                invokerbutton.invokeaction = action;
+              } else {
+                invokerbutton.setAttribute("invokeaction", action);
+              }
+            }
+            await clickOn(invokerbutton);
+            assert_false(invokee.open, "invokee.open");
+            assert_false(invokee.matches(":modal"), "invokee :modal");
+          },
+          `invoking (with invokeaction ${setType} as ${
+            action == null ? "auto" : action || "explicit empty"
+          }) closed dialog with preventDefault is noop`,
+        );
+
+        promise_test(
+          async function (t) {
+            t.add_cleanup(resetState);
+            assert_false(invokee.open, "invokee.open");
+            assert_false(invokee.matches(":modal"), "invokee :modal");
+            invokee.addEventListener(
+              "invoke",
+              (e) => {
+                invokerbutton.setAttribute("invokeaction", "close");
+              },
+              { once: true },
+            );
+            if (typeof action === "string") {
+              if (setType === "property") {
+                invokerbutton.invokeaction = action;
+              } else {
+                invokerbutton.setAttribute("invokeaction", action);
+              }
+            }
+            await clickOn(invokerbutton);
+            assert_true(invokee.open, "invokee.open");
+            assert_true(invokee.matches(":modal"), "invokee :modal");
+          },
+          `invoking (with invokeaction ${setType} as ${
+            action == null ? "auto" : action || "explicit empty"
+          }) while changing action still opens as modal`,
+        );
+      });
+    },
+  );
+
+  // closing an already open dialog
+
+  [null, "", "close", /* test case sensitivity */ "cLoSe"].forEach((action) => {
+    ["property", "attribute"].forEach((setType) => {
+      promise_test(
+        async function (t) {
+          t.add_cleanup(resetState);
+          invokee.show();
+          assert_true(invokee.open, "invokee.open");
+          assert_false(invokee.matches(":modal"), "invokee :modal");
+          if (typeof action === "string") {
+            if (setType === "property") {
+              containedinvoker.invokeaction = action;
+            } else {
+              containedinvoker.setAttribute("invokeaction", action);
+            }
+          }
+          await clickOn(containedinvoker);
+          assert_false(invokee.open, "invokee.open");
+          assert_false(invokee.matches(":modal"), "invokee :modal");
+        },
+        `invoking to close (with invokeaction ${setType} as ${
+          action == null ? "auto" : action || "explicit empty"
+        }) open dialog closes`,
+      );
+
+      promise_test(
+        async function (t) {
+          t.add_cleanup(resetState);
+          invokee.show();
+          assert_true(invokee.open, "invokee.open");
+          assert_false(invokee.matches(":modal"), "invokee :modal");
+          if (typeof action === "string") {
+            if (setType === "property") {
+              containedinvoker.invokeaction = action;
+            } else {
+              containedinvoker.setAttribute("invokeaction", action);
+            }
+          }
+          invokee.addEventListener("invoke", (e) => e.preventDefault(), {
+            once: true,
+          });
+          await clickOn(containedinvoker);
+          assert_true(invokee.open, "invokee.open");
+          assert_false(invokee.matches(":modal"), "invokee :modal");
+        },
+        `invoking to close (with invokeaction ${setType} as ${
+          action == null ? "auto" : action || "explicit empty"
+        }) open dialog with preventDefault is no-op`,
+      );
+
+      promise_test(
+        async function (t) {
+          t.add_cleanup(resetState);
+          invokee.showModal();
+          assert_true(invokee.open, "invokee.open");
+          assert_true(invokee.matches(":modal"), "invokee :modal");
+          if (typeof action === "string") {
+            if (setType === "property") {
+              containedinvoker.invokeaction = action;
+            } else {
+              containedinvoker.setAttribute("invokeaction", action);
+            }
+          }
+          invokee.addEventListener("invoke", (e) => e.preventDefault(), {
+            once: true,
+          });
+          await clickOn(containedinvoker);
+          assert_true(invokee.open, "invokee.open");
+          assert_true(invokee.matches(":modal"), "invokee :modal");
+        },
+        `invoking to close (with invokeaction ${setType} as ${
+          action == null ? "auto" : action || "explicit empty"
+        }) open modal dialog with preventDefault is no-op`,
+      );
+
+      promise_test(
+        async function (t) {
+          t.add_cleanup(resetState);
+          invokee.show();
+          assert_true(invokee.open, "invokee.open");
+          assert_false(invokee.matches(":modal"), "invokee :modal");
+          if (typeof action === "string") {
+            if (setType === "property") {
+              containedinvoker.invokeaction = action;
+            } else {
+              containedinvoker.setAttribute("invokeaction", action);
+            }
+          }
+          invokee.addEventListener(
+            "invoke",
+            (e) => {
+              containedinvoker.setAttribute("invokeaction", "show");
+            },
+            { once: true },
+          );
+          await clickOn(containedinvoker);
+          assert_false(invokee.open, "invokee.open");
+          assert_false(invokee.matches(":modal"), "invokee :modal");
+        },
+        `invoking to close (with invokeaction ${setType} as ${
+          action == null ? "auto" : action || "explicit empty"
+        }) open dialog while changing action still closes`,
+      );
+
+      promise_test(
+        async function (t) {
+          t.add_cleanup(resetState);
+          invokee.showModal();
+          assert_true(invokee.open, "invokee.open");
+          assert_true(invokee.matches(":modal"), "invokee :modal");
+          if (typeof action === "string") {
+            if (setType === "property") {
+              containedinvoker.invokeaction = action;
+            } else {
+              containedinvoker.setAttribute("invokeaction", action);
+            }
+          }
+          invokee.addEventListener(
+            "invoke",
+            (e) => {
+              containedinvoker.setAttribute("invokeaction", "show");
+            },
+            { once: true },
+          );
+          await clickOn(containedinvoker);
+          assert_false(invokee.open, "invokee.open");
+          assert_false(invokee.matches(":modal"), "invokee :modal");
+        },
+        `invoking to close (with invokeaction ${setType} as ${
+          action == null ? "auto" : action || "explicit empty"
+        }) open modal dialog while changing action still closes`,
+      );
+    });
+  });
+
+  // showmodal explicit behaviours
+
+  promise_test(async function (t) {
+    t.add_cleanup(resetState);
+    containedinvoker.setAttribute("invokeaction", "showModal");
+    invokee.show();
+    assert_true(invokee.open, "invokee.open");
+    assert_false(invokee.matches(":modal"), "invokee :modal");
+    await clickOn(containedinvoker);
+    assert_true(invokee.open, "invokee.open");
+    assert_false(invokee.matches(":modal"), "invokee :modal");
+  }, "invoking (as showmodal) open dialog is noop");
+
+  promise_test(async function (t) {
+    t.add_cleanup(resetState);
+    containedinvoker.setAttribute("invokeaction", "showmodal");
+    invokee.showModal();
+    assert_true(invokee.open, "invokee.open");
+    assert_true(invokee.matches(":modal"), "invokee :modal");
+    invokee.addEventListener(
+      "invoke",
+      (e) => {
+        containedinvoker.setAttribute("invokeaction", "close");
+      },
+      { once: true },
+    );
+    await clickOn(invokerbutton);
+    assert_true(invokee.open, "invokee.open");
+    assert_true(invokee.matches(":modal"), "invokee :modal");
+  }, "invoking (as showmodal) open modal, while changing action still a no-op");
+
+  promise_test(async function (t) {
+    t.add_cleanup(resetState);
+    invokerbutton.setAttribute("invokeaction", "showmodal");
+    assert_false(invokee.open, "invokee.open");
+    assert_false(invokee.matches(":modal"), "invokee :modal");
+    invokee.setAttribute("popover", "auto");
+    await clickOn(invokerbutton);
+    assert_true(invokee.open, "invokee.open");
+    assert_true(invokee.matches(":modal"), "invokee :modal");
+  }, "invoking (as showmodal) closed popover dialog opens as modal");
+
+  // close explicit behaviours
+
+  promise_test(async function (t) {
+    t.add_cleanup(resetState);
+    invokerbutton.setAttribute("invokeaction", "close");
+    assert_false(invokee.open, "invokee.open");
+    assert_false(invokee.matches(":modal"), "invokee :modal");
+    await clickOn(containedinvoker);
+    assert_false(invokee.open, "invokee.open");
+    assert_false(invokee.matches(":modal"), "invokee :modal");
+  }, "invoking (as close) already closed dialog is noop");
+
+  // invalid
+  [
+    "foo",
+    "foo-bar",
+    "auto",
+    "showpopover",
+    "hidepopover",
+    "togglepopover",
+    "showpicker",
+  ].forEach((action) => {
+    promise_test(async function (t) {
+      t.add_cleanup(resetState);
+      invokerbutton.setAttribute("invokeaction", action);
+      assert_false(invokee.open, "invokee.open");
+      assert_false(invokee.matches(":modal"), "invokee :modal");
+      await clickOn(invokerbutton);
+      assert_false(invokee.open, "invokee.open");
+      assert_false(invokee.matches(":modal"), "invokee :modal");
+    }, `invoking (as ${action}) on dialog does nothing`);
+
+    promise_test(async function (t) {
+      t.add_cleanup(resetState);
+      containedinvoker.setAttribute("invokeaction", action);
+      invokee.show();
+      assert_true(invokee.open, "invokee.open");
+      assert_false(invokee.matches(":modal"), "invokee :modal");
+      await clickOn(containedinvoker);
+      assert_true(invokee.open, "invokee.open");
+      assert_false(invokee.matches(":modal"), "invokee :modal");
+    }, `invoking (as ${action}) on open dialog does nothing`);
+
+    promise_test(async function (t) {
+      t.add_cleanup(resetState);
+      containedinvoker.setAttribute("invokeaction", action);
+      invokee.showModal();
+      assert_true(invokee.open, "invokee.open");
+      assert_true(invokee.matches(":modal"), "invokee :modal");
+      await clickOn(containedinvoker);
+      assert_true(invokee.open, "invokee.open");
+      assert_true(invokee.matches(":modal"), "invokee :modal");
+    }, `invoking (as ${action}) on open modal dialog does nothing`);
+
+    promise_test(async function (t) {
+      t.add_cleanup(resetState);
+      containedinvoker.setAttribute("invokeaction", action);
+      invokee.showModal();
+      assert_true(invokee.open, "invokee.open");
+      assert_true(invokee.matches(":modal"), "invokee :modal");
+      invokee.addEventListener(
+        "invoke",
+        (e) => {
+          containedinvoker.setAttribute("invokeaction", "");
+        },
+        { once: true },
+      );
+      await clickOn(containedinvoker);
+      assert_true(invokee.open, "invokee.open");
+      assert_true(invokee.matches(":modal"), "invokee :modal");
+    }, `invoking (as ${action}) on open modal while changing the attributer does nothing`);
+  });
+
+  // Open Popovers using Dialog actions
+  ["showmodal", "close", ""].forEach((action) => {
+    ["manual", "auto"].forEach((popoverState) => {
+      promise_test(
+        async function (t) {
+          t.add_cleanup(resetState);
+          invokee.setAttribute("popover", popoverState);
+          invokee.showPopover();
+          containedinvoker.setAttribute("invokeaction", action);
+          assert_true(
+            invokee.matches(":popover-open"),
+            "invokee :popover-open",
+          );
+          assert_false(invokee.open, "invokee.open");
+          assert_false(invokee.matches(":modal"), "invokee :modal");
+          invokee.addEventListener("invoke", (e) => e.preventDefault(), {
+            once: true,
+          });
+          await clickOn(containedinvoker);
+          assert_true(
+            invokee.matches(":popover-open"),
+            "invokee :popover-open",
+          );
+          assert_false(invokee.open, "invokee.open");
+          assert_false(invokee.matches(":modal"), "invokee :modal");
+        },
+        `invoking (as ${
+          action || "explicit empty"
+        }) dialog as open popover=${popoverState} is noop`,
+      );
+    });
+  });
+
+  // Elements being disconnected during invoke steps
+  ["showmodal", "close", ""].forEach((action) => {
+    promise_test(
+      async function (t) {
+        t.add_cleanup(() => {
+          document.body.prepend(invokee);
+          resetState();
+        });
+        const invokee = document.querySelector("#invokee");
+        invokerbutton.setAttribute("invokeaction", action);
+        assert_false(invokee.open, "invokee.open");
+        assert_false(invokee.matches(":modal"), "invokee :modal");
+        invokee.addEventListener(
+          "invoke",
+          (e) => {
+            invokee.remove();
+          },
+          {
+            once: true,
+          },
+        );
+        await clickOn(invokerbutton);
+        assert_false(invokee.open, "invokee.open");
+        assert_false(invokee.matches(":modal"), "invokee :modal");
+      },
+      `invoking (as ${
+        action || "explicit empty"
+      }) dialog that is removed is noop`,
+    );
+
+    promise_test(
+      async function (t) {
+        const invokerbutton = document.createElement("button");
+        invokerbutton.invokeTargetElement = invokee;
+        invokerbutton.setAttribute("invokeaction", action);
+        assert_false(invokee.open, "invokee.open");
+        assert_false(invokee.matches(":modal"), "invokee :modal");
+        await clickOn(invokerbutton);
+        assert_false(invokee.open, "invokee.open");
+        assert_false(invokee.matches(":modal"), "invokee :modal");
+      },
+      `invoking (as ${
+        action || "explicit empty"
+      }) dialog from a detached invoker`,
+    );
+
+    promise_test(
+      async function (t) {
+        const invokerbutton = document.createElement("button");
+        const invokee = document.createElement("dialog");
+        invokerbutton.invokeTargetElement = invokee;
+        invokerbutton.setAttribute("invokeaction", action);
+        assert_false(invokee.open, "invokee.open");
+        assert_false(invokee.matches(":modal"), "invokee :modal");
+        await clickOn(invokerbutton);
+        assert_false(invokee.open, "invokee.open");
+        assert_false(invokee.matches(":modal"), "invokee :modal");
+      },
+      `invoking (as ${
+        action || "explicit empty"
+      }) detached dialog from a detached invoker`,
+    );
+  });
+</script>
diff --git a/testing/web-platform/tests/html/semantics/invokers/invoketarget-on-popover-behavior.tentative.html b/testing/web-platform/tests/html/semantics/invokers/invoketarget-on-popover-behavior.tentative.html
index 03eba22285..2bddfa7621 100644
--- a/testing/web-platform/tests/html/semantics/invokers/invoketarget-on-popover-behavior.tentative.html
+++ b/testing/web-platform/tests/html/semantics/invokers/invoketarget-on-popover-behavior.tentative.html
@@ -10,7 +10,7 @@
 <script src="resources/invoker-utils.js"></script>
 
 <div id="invokee" popover>
-  <button id="invokerbutton2" invoketarget="invokee"></button>
+  <button id="containedinvoker" invoketarget="invokee"></button>
 </div>
 <button id="invokerbutton" invoketarget="invokee"></button>
 
@@ -44,7 +44,7 @@
   promise_test(async function (t) {
     invokee.showPopover();
     assert_true(invokee.matches(":popover-open"));
-    await clickOn(invokerbutton2);
+    await clickOn(containedinvoker);
     assert_false(invokee.matches(":popover-open"));
   }, "invoking (as auto) from within open popover closes");
 
@@ -55,7 +55,7 @@
       once: true,
     });
     assert_true(invokee.matches(":popover-open"));
-    await clickOn(invokerbutton2);
+    await clickOn(containedinvoker);
     assert_true(invokee.matches(":popover-open"));
   }, "invoking (as auto) open popover with preventDefault does not close");
 
@@ -93,8 +93,8 @@
 
   promise_test(async function (t) {
     invokee.showPopover();
-    invokerbutton2.setAttribute("invokeaction", "togglepopover");
-    t.add_cleanup(() => invokerbutton2.removeAttribute("invokeaction"));
+    containedinvoker.setAttribute("invokeaction", "togglepopover");
+    t.add_cleanup(() => containedinvoker.removeAttribute("invokeaction"));
     assert_true(invokee.matches(":popover-open"));
     await clickOn(invokerbutton);
     assert_false(invokee.matches(":popover-open"));
@@ -102,23 +102,23 @@
 
   promise_test(async function (t) {
     invokee.showPopover();
-    invokerbutton2.setAttribute("invokeaction", "togglepopover");
-    t.add_cleanup(() => invokerbutton2.removeAttribute("invokeaction"));
+    containedinvoker.setAttribute("invokeaction", "togglepopover");
+    t.add_cleanup(() => containedinvoker.removeAttribute("invokeaction"));
     assert_true(invokee.matches(":popover-open"));
-    await clickOn(invokerbutton2);
+    await clickOn(containedinvoker);
     assert_false(invokee.matches(":popover-open"));
   }, "invoking (as togglepopover) from within open popover closes");
 
   promise_test(async function (t) {
     invokee.showPopover();
     t.add_cleanup(() => invokee.hidePopover());
-    invokerbutton2.setAttribute("invokeaction", "togglepopover");
-    t.add_cleanup(() => invokerbutton2.removeAttribute("invokeaction"));
+    containedinvoker.setAttribute("invokeaction", "togglepopover");
+    t.add_cleanup(() => containedinvoker.removeAttribute("invokeaction"));
     invokee.addEventListener("invoke", (e) => e.preventDefault(), {
       once: true,
     });
     assert_true(invokee.matches(":popover-open"));
-    await clickOn(invokerbutton2);
+    await clickOn(containedinvoker);
     assert_true(invokee.matches(":popover-open"));
   }, "invoking (as togglepopover) open popover with preventDefault does not close");
 
@@ -175,35 +175,59 @@
   }, "invoking (as hidepopover) closed popover is noop");
 
   promise_test(async function (t) {
-    invokerbutton2.setAttribute("invokeaction", "hidepopover");
-    t.add_cleanup(() => invokerbutton2.removeAttribute("invokeaction"));
+    containedinvoker.setAttribute("invokeaction", "hidepopover");
+    t.add_cleanup(() => containedinvoker.removeAttribute("invokeaction"));
     invokee.showPopover();
     assert_true(invokee.matches(":popover-open"));
-    await clickOn(invokerbutton2);
+    await clickOn(containedinvoker);
     t.add_cleanup(() => invokee.hidePopover());
     assert_false(invokee.matches(":popover-open"));
   }, "invoking (as hidepopover) open popover closes");
 
   promise_test(async function (t) {
-    invokerbutton2.setAttribute("invokeaction", "hIdEpOpOvEr");
-    t.add_cleanup(() => invokerbutton2.removeAttribute("invokeaction"));
+    containedinvoker.setAttribute("invokeaction", "hIdEpOpOvEr");
+    t.add_cleanup(() => containedinvoker.removeAttribute("invokeaction"));
     invokee.showPopover();
     assert_true(invokee.matches(":popover-open"));
-    await clickOn(invokerbutton2);
+    await clickOn(containedinvoker);
     t.add_cleanup(() => invokee.hidePopover());
     assert_false(invokee.matches(":popover-open"));
   }, "invoking (as hidepopover - case insensitive) open popover closes");
 
   promise_test(async function (t) {
-    invokerbutton2.setAttribute("invokeaction", "hidepopover");
-    t.add_cleanup(() => invokerbutton2.removeAttribute("invokeaction"));
+    containedinvoker.setAttribute("invokeaction", "hidepopover");
+    t.add_cleanup(() => containedinvoker.removeAttribute("invokeaction"));
     invokee.showPopover();
     t.add_cleanup(() => invokee.hidePopover());
     assert_true(invokee.matches(":popover-open"));
     invokee.addEventListener("invoke", (e) => e.preventDefault(), {
       once: true,
     });
-    await clickOn(invokerbutton2);
+    await clickOn(containedinvoker);
     assert_true(invokee.matches(":popover-open"));
   }, "invoking (as hidepopover) open popover with preventDefault does not close");
+
+  // invalid
+
+  ["foo", "togglemodal", "showpicker", "toggle", "open", "close"].forEach(action => {
+    promise_test(async function (t) {
+      invokerbutton.setAttribute("invokeaction", action);
+      t.add_cleanup(() => invokerbutton.removeAttribute("invokeaction"));
+      assert_false(invokee.matches(":popover-open"));
+      await clickOn(invokerbutton);
+      assert_false(invokee.matches(":popover-open"));
+    }, `invoking (as ${action}) on popover does nothing`);
+
+    promise_test(async function (t) {
+      invokerbutton.setAttribute("invokeaction", action);
+      t.add_cleanup(() => {
+        invokerbutton.removeAttribute("invokeaction")
+        invokee.hidePopover();
+      });
+      invokee.showPopover()
+      assert_true(invokee.matches(":popover-open"));
+      await clickOn(invokerbutton);
+      assert_true(invokee.matches(":popover-open"));
+    }, `invoking (as ${action}) on open popover does nothing`);
+  })
 </script>
diff --git a/testing/web-platform/tests/html/semantics/invokers/resources/invoker-utils.js b/testing/web-platform/tests/html/semantics/invokers/resources/invoker-utils.js
index 317945502d..8420f24b6f 100644
--- a/testing/web-platform/tests/html/semantics/invokers/resources/invoker-utils.js
+++ b/testing/web-platform/tests/html/semantics/invokers/resources/invoker-utils.js
@@ -2,9 +2,13 @@ function waitForRender() {
   return new Promise(resolve => requestAnimationFrame(() => requestAnimationFrame(resolve)));
 }
 async function clickOn(element) {
-  const actions = new test_driver.Actions();
   await waitForRender();
-  await actions.pointerMove(0, 0, {origin: element})
+  let rect = element.getBoundingClientRect();
+  let actions = new test_driver.Actions();
+  // FIXME: Switch to pointerMove(0, 0, {origin: element}) once
+  // https://github.com/web-platform-tests/wpt/issues/41257 is fixed.
+  await actions
+      .pointerMove(Math.round(rect.x + rect.width / 2), Math.round(rect.y + rect.height / 2), {})
       .pointerDown({button: actions.ButtonType.LEFT})
       .pointerUp({button: actions.ButtonType.LEFT})
       .send();
diff --git a/testing/web-platform/tests/html/semantics/permission-element/bounded-css-properties.html b/testing/web-platform/tests/html/semantics/permission-element/bounded-css-properties.html
new file mode 100644
index 0000000000..98c3d70e98
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/permission-element/bounded-css-properties.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<!--The permission element should have some limits for specific properties:
+  * font-weight is adjusted to be at least 200.
+  * font-style should only have "normal" or "italic" values.
+-->
+<style>
+  #id1 {
+    font-weight: 100;
+    font-style: oblique 30deg;
+  }
+  #id2 {
+    font-weight: 300;
+    font-style: italic;
+  }
+</style>
+
+
+<permission id="id1" type="geolocation">
+<permission id="id2" type="camera">
+
+<script>
+  test(function(){
+    var el_outside_bounds = document.getElementById("id1");
+    assert_equals(getComputedStyle(el_outside_bounds).fontWeight, "200", "font-weight");
+    assert_equals(getComputedStyle(el_outside_bounds).fontStyle, "normal", "font-style");
+  }, "Properties with out-of-bounds values should be corrected");
+
+  test(function(){
+    var el_inside_bounds = document.getElementById("id2");
+    assert_equals(getComputedStyle(el_inside_bounds).fontWeight, "300", "font-weight");
+    assert_equals(getComputedStyle(el_inside_bounds).fontStyle, "italic", "font-style");
+  }, "Properties with values in bounds should not be modified");
+</script>
+</body>
\ No newline at end of file
diff --git a/testing/web-platform/tests/html/semantics/permission-element/invalid-css-properties.html b/testing/web-platform/tests/html/semantics/permission-element/invalid-css-properties.html
new file mode 100644
index 0000000000..c7186563f0
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/permission-element/invalid-css-properties.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<!--The permission element does not allow certain CSS properties
+-->
+<style>
+  #id1 {
+    border-image: url('test-url');
+    background-image: url('test-url');
+    clip-path: circle(10px);
+    filter: blur(10px);
+    mask: url('test-url');
+    padding-left: 10px;
+    transform: rotate(10);
+  }
+</style>
+
+<permission id="id1" type="geolocation">
+
+<script>
+  test(function(){
+    var el_with_negatives = document.getElementById("id1");
+    assert_equals(getComputedStyle(el_with_negatives).borderImage, "none", "border-image");
+    assert_equals(getComputedStyle(el_with_negatives).backgroundImage, "none", "background-image");
+    assert_equals(getComputedStyle(el_with_negatives).clipPath, "none", "clip-path");
+    assert_equals(getComputedStyle(el_with_negatives).filter, "none", "filter");
+    assert_equals(getComputedStyle(el_with_negatives).mask, "none", "mask");
+    assert_equals(getComputedStyle(el_with_negatives).paddingLeft, "0px", "padding-left");
+    assert_equals(getComputedStyle(el_with_negatives).transform, "none", "transform");
+  }, "None of the listed properties should be applied");
+</script>
+</body>
\ No newline at end of file
diff --git a/testing/web-platform/tests/html/semantics/permission-element/negative-offset-and-margin.html b/testing/web-platform/tests/html/semantics/permission-element/negative-offset-and-margin.html
new file mode 100644
index 0000000000..97290bb4df
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/permission-element/negative-offset-and-margin.html
@@ -0,0 +1,67 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<!--The permission element should not allow setting negative margins or outline-offset
+-->
+<style>
+  #id1 {
+    outline-offset: -50px;
+    margin-top: -50px;
+    margin-left: -50px;
+    margin-bottom: -50px;
+    margin-right: -50px;
+  }
+  #id2 {
+    outline-offset: 50px;
+    margin-top: 50px;
+    margin-left: 50px;
+    margin-bottom: 50px;
+    margin-right: 50px;
+  }
+
+  /* These various expressions all result in a negative value when calculated */
+  #id3 {
+    outline-offset: min(-50px, 50px);
+    margin-top: min(10%, -50px);
+    margin-left: clamp(-100px, 1vw, -50px);
+    margin-bottom: 1% - 10000px;
+    margin-right: max(min(-1em, 10em), -5%);
+  }
+</style>
+
+
+<permission id="id1" type="geolocation">
+<permission id="id2" type="camera">
+<permission id="id3" type="microphone">
+
+<script>
+  test(function(){
+    var el_with_negatives = document.getElementById("id1");
+    assert_equals(getComputedStyle(el_with_negatives).outlineOffset, "0px", "outline-offset");
+    assert_equals(getComputedStyle(el_with_negatives).marginLeft, "0px", "margin-left");
+    assert_equals(getComputedStyle(el_with_negatives).marginRight, "0px", "margin-right");
+    assert_equals(getComputedStyle(el_with_negatives).marginTop, "0px", "margin-top");
+    assert_equals(getComputedStyle(el_with_negatives).marginBottom, "0px", "margin-bottom");
+  }, "Negative margins/offset should be changed to 0px");
+
+  test(function(){
+    var el_with_positives = document.getElementById("id2");
+    assert_equals(getComputedStyle(el_with_positives).outlineOffset, "50px", "outline-offset");
+    assert_equals(getComputedStyle(el_with_positives).marginLeft, "50px", "margin-left");
+    assert_equals(getComputedStyle(el_with_positives).marginRight, "50px", "margin-right");
+    assert_equals(getComputedStyle(el_with_positives).marginTop, "50px", "margin-top");
+    assert_equals(getComputedStyle(el_with_positives).marginBottom, "50px", "margin-bottom");
+  }, "Positive margins/offset are unaffected");
+
+  test(function(){
+    var el_with_negative_expr = document.getElementById("id3");
+    assert_equals(getComputedStyle(el_with_negative_expr).outlineOffset, "0px", "outline-offset");
+    assert_equals(getComputedStyle(el_with_negative_expr).marginLeft, "0px", "margin-left");
+    assert_equals(getComputedStyle(el_with_negative_expr).marginRight, "0px", "margin-right");
+    assert_equals(getComputedStyle(el_with_negative_expr).marginTop, "0px", "margin-top");
+    assert_equals(getComputedStyle(el_with_negative_expr).marginBottom, "0px", "margin-bottom");
+  }, "Expressions margins/offset should always return at least 0px");
+</script>
+</body>
\ No newline at end of file
diff --git a/testing/web-platform/tests/html/semantics/popovers/popover-shadow-dom-anchor.tentative.html b/testing/web-platform/tests/html/semantics/popovers/popover-shadow-dom-anchor.tentative.html
new file mode 100644
index 0000000000..7c87d2d039
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/popovers/popover-shadow-dom-anchor.tentative.html
@@ -0,0 +1,99 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<link rel="author" href="mailto:masonf@chromium.org">
+<link rel=help href="https://open-ui.org/components/popover.research.explainer">
+<link rel=help href="https://html.spec.whatwg.org/multipage/popover.html">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/popover-utils.js"></script>
+
+<!-- Once anchor positioning lands in the spec, the tests in this file can
+     be re-inserted into popover-shadow-dom.html. -->
+
+<script>
+  function findPopovers(root) {
+    let popovers = [];
+    if (!root)
+      return popovers;
+    if (root instanceof Element && root.matches('[popover]'))
+      popovers.push(root);
+    popovers.push(...findPopovers(root.shadowRoot));
+    root.childNodes.forEach(child => {
+      popovers.push(...findPopovers(child));
+    })
+    return popovers;
+  }
+  function getPopoverReferences(testId) {
+    const testRoot = document.querySelector(`#${testId}`);
+    assert_true(!!testRoot);
+    return findPopovers(testRoot);
+  }
+</script>
+
+<div id=test1>
+  <button id=t2b1>Test 1 Popover 1</button>
+  <div popover anchor=t2b1 style="top: 200px;">
+    <p>Popover 1</p>
+    <button id=t2b2>Test 1 Popover 2</button>
+  </div>
+  <my-element>
+    <template shadowrootmode=open>
+      <div popover anchor=t2b2 style="top: 400px;">
+        <p>Hiding this popover will hide *all* open popovers,</p>
+        <p>because t2b2 doesn't exist in this context.</p>
+      </div>
+    </template>
+  </my-element>
+</div>
+
+<script>
+  test(function() {
+    const [popover1,popover2] = getPopoverReferences('test1');
+    popover1.showPopover();
+    assert_true(popover1.matches(':popover-open'));
+    assert_true(isElementVisible(popover1));
+    popover2.showPopover();
+    assert_false(popover1.matches(':popover-open'), 'popover1 open'); // P1 was closed by P2
+    assert_false(isElementVisible(popover1), 'popover1 visible');
+    assert_true(popover2.matches(':popover-open'), 'popover2 open'); // P2 is open
+    assert_true(isElementVisible(popover2), 'popover2 visible');
+    popover2.hidePopover(); // Cleanup
+  }, "anchor references do not cross shadow boundaries");
+</script>
+
+
+<div id=test2>
+  <my-element>
+    <template shadowrootmode=open>
+      <button id=t3b1>Test 2 Popover 1</button>
+      <div popover anchor=t3b1>
+        <p>This popover will stay open when popover2 shows.</p>
+        <slot></slot>
+      </div>
+    </template>
+    <button id=t3b2>Test 2 Popover 2</button>
+  </my-element>
+  <div popover anchor=t3b2>Popover 2</div>
+</div>
+
+<script>
+  promise_test(async function() {
+    const [popover1,popover2] = getPopoverReferences('test2');
+    popover1.showPopover();
+    assert_true(popover1.matches(':popover-open'));
+    assert_true(isElementVisible(popover1));
+    // Showing popover2 should not close popover1, since it is a flat
+    // tree ancestor of popover2's anchor button.
+    popover2.showPopover();
+    assert_true(popover2.matches(':popover-open'));
+    assert_true(isElementVisible(popover2));
+    assert_true(popover1.matches(':popover-open'));
+    assert_true(isElementVisible(popover1));
+    popover1.hidePopover();
+    await waitForRender();
+    assert_false(popover1.matches(':popover-open'));
+    assert_false(isElementVisible(popover1));
+    assert_false(popover2.matches(':popover-open'));
+    assert_false(isElementVisible(popover2));
+  }, "anchor references use the flat tree not the DOM tree");
+</script>
diff --git a/testing/web-platform/tests/html/semantics/popovers/popover-shadow-dom.html b/testing/web-platform/tests/html/semantics/popovers/popover-shadow-dom.html
index 62aa135b56..18ac500270 100644
--- a/testing/web-platform/tests/html/semantics/popovers/popover-shadow-dom.html
+++ b/testing/web-platform/tests/html/semantics/popovers/popover-shadow-dom.html
@@ -8,17 +8,6 @@
 <script src="resources/popover-utils.js"></script>
 
 <script>
-  function ensureShadowDom(host) {
-    host.querySelectorAll('my-element').forEach(host => {
-      if (host.shadowRoot)
-        return; // Declarative Shadow DOM is enabled
-      const template = host.firstElementChild;
-      assert_true(template instanceof HTMLTemplateElement);
-      const shadow = host.attachShadow({mode: 'open'});
-      shadow.appendChild(template.content);
-      template.remove();
-    })
-  }
   function findPopovers(root) {
     let popovers = [];
     if (!root)
@@ -34,16 +23,12 @@
   function getPopoverReferences(testId) {
     const testRoot = document.querySelector(`#${testId}`);
     assert_true(!!testRoot);
-    ensureShadowDom(testRoot);
     return findPopovers(testRoot);
   }
-  function showTestPopover(testId,popoverNum) {
-    getPopoverReferences(testId)[popoverNum].showPopover();
-  }
 </script>
 
 <div id=test1>
-  <button onclick='showTestPopover("test1",0)'>Test1 Popover</button>
+  <button>Test1 Popover</button>
   <my-element>
     <template shadowrootmode=open>
       <div popover>
@@ -64,83 +49,14 @@
 </script>
 
 
-<div id=test2>
-  <button id=t2b1 onclick='showTestPopover("test2",0)'>Test 2 Popover 1</button>
-  <div popover anchor=t2b1 style="top: 200px;">
-    <p>Popover 1</p>
-    <button id=t2b2 onclick='showTestPopover("test2",1)'>Test 2 Popover 2</button>
-  </div>
-  <my-element>
-    <template shadowrootmode=open>
-      <div popover anchor=t2b2 style="top: 400px;">
-        <p>Hiding this popover will hide *all* open popovers,</p>
-        <p>because t2b2 doesn't exist in this context.</p>
-      </div>
-    </template>
-  </my-element>
-</div>
-
-<script>
-  test(function() {
-    const [popover1,popover2] = getPopoverReferences('test2');
-    popover1.showPopover();
-    assert_true(popover1.matches(':popover-open'));
-    assert_true(isElementVisible(popover1));
-    popover2.showPopover();
-    assert_false(popover1.matches(':popover-open'), 'popover1 open'); // P1 was closed by P2
-    assert_false(isElementVisible(popover1), 'popover1 visible');
-    assert_true(popover2.matches(':popover-open'), 'popover2 open'); // P2 is open
-    assert_true(isElementVisible(popover2), 'popover2 visible');
-    popover2.hidePopover(); // Cleanup
-  }, "anchor references do not cross shadow boundaries");
-</script>
-
-
-<div id=test3>
-  <my-element>
-    <template shadowrootmode=open>
-      <button id=t3b1 onclick='showTestPopover("test3",0)'>Test 3 Popover 1</button>
-      <div popover anchor=t3b1>
-        <p>This popover will stay open when popover2 shows.</p>
-        <slot></slot>
-      </div>
-    </template>
-    <button id=t3b2 onclick='showTestPopover("test3",1)'>Test 3 Popover 2</button>
-  </my-element>
-  <div popover anchor=t3b2>Popover 2</div>
-</div>
-
-<script>
-  promise_test(async function() {
-    const [popover1,popover2] = getPopoverReferences('test3');
-    popover1.showPopover();
-    assert_true(popover1.matches(':popover-open'));
-    assert_true(isElementVisible(popover1));
-    // Showing popover2 should not close popover1, since it is a flat
-    // tree ancestor of popover2's anchor button.
-    popover2.showPopover();
-    assert_true(popover2.matches(':popover-open'));
-    assert_true(isElementVisible(popover2));
-    assert_true(popover1.matches(':popover-open'));
-    assert_true(isElementVisible(popover1));
-    popover1.hidePopover();
-    await waitForRender();
-    assert_false(popover1.matches(':popover-open'));
-    assert_false(isElementVisible(popover1));
-    assert_false(popover2.matches(':popover-open'));
-    assert_false(isElementVisible(popover2));
-  }, "anchor references use the flat tree not the DOM tree");
-</script>
-
-
 <div id=test4>
-  <button id=t4b1 onclick='showTestPopover("test4",0)'>Test 4 Popover 1</button>
-  <div popover anchor=t4b1>
+  <button>Test 4 Popover 1</button>
+  <div popover>
     <p>This should not get hidden when popover2 opens.</p>
     <my-element>
       <template shadowrootmode=open>
-        <button id=t4b2 onclick='showTestPopover("test4",1)'>Test 4 Popover 2</button>
-        <div popover anchor=t4b2>
+        <button id=t4b2>Test 4 Popover 2</button>
+        <div popover>
           <p>This should not hide popover1.</p>
         </div>
       </template>
diff --git a/testing/web-platform/tests/html/semantics/popovers/popovertarget-reflection.html b/testing/web-platform/tests/html/semantics/popovers/popovertarget-reflection.html
index d0750fdd4c..b4f99631ab 100644
--- a/testing/web-platform/tests/html/semantics/popovers/popovertarget-reflection.html
+++ b/testing/web-platform/tests/html/semantics/popovers/popovertarget-reflection.html
@@ -11,7 +11,7 @@
 
 <script>
 test(() => {
-   assert_equals(mybutton.popoverTargetElement.id, "mypopover",
+  assert_equals(mybutton.popoverTargetElement.id, "mypopover",
     'Setting element.popoverTargetElement to a valid element should work');
 
   mybutton.popoverTargetElement = null;
@@ -33,13 +33,13 @@ test(() => {
     'Assigning to element.popoverTargetElement should set the popovertarget attribute.');
 
   mybutton.setAttribute("popovertarget", 'invalid');
-    assert_equals(mybutton.popoverTargetElement, null,
+  assert_equals(mybutton.popoverTargetElement, null,
     'Setting the popovertarget attribute to a localName that is not attr should remove the existing element from element.popoverTargetElement.');
 
   mybutton.popoverTargetElement = mypopover;
   mybutton.setAttribute("popovertarget", "");
-  assert_equals(mybutton.popoverTargetElement.id, "mypopover",
-    'Setting the popovertarget attribute to empty string right after explicitly setting attribute element should have no effect.');
+  assert_equals(mybutton.popoverTargetElement, null,
+    'Setting the popovertarget attribute to empty string right after setting explicit element does remove the explicit element.');
 
   mybutton.setAttribute("popovertarget", "mypopover");
   assert_equals(mybutton.popoverTargetElement.id, "mypopover",
diff --git a/testing/web-platform/tests/html/semantics/popovers/resources/popover-utils.js b/testing/web-platform/tests/html/semantics/popovers/resources/popover-utils.js
index bfc1f89ec1..96ac7e03f0 100644
--- a/testing/web-platform/tests/html/semantics/popovers/resources/popover-utils.js
+++ b/testing/web-platform/tests/html/semantics/popovers/resources/popover-utils.js
@@ -7,9 +7,13 @@ function waitForTick() {
 }
 
 async function clickOn(element) {
-  const actions = new test_driver.Actions();
   await waitForRender();
-  await actions.pointerMove(0, 0, {origin: element})
+  let rect = element.getBoundingClientRect();
+  let actions = new test_driver.Actions();
+  // FIXME: Switch to pointerMove(0, 0, {origin: element}) once
+  // https://github.com/web-platform-tests/wpt/issues/41257 is fixed.
+  await actions
+      .pointerMove(Math.round(rect.x + rect.width / 2), Math.round(rect.y + rect.height / 2), {})
       .pointerDown({button: actions.ButtonType.LEFT})
       .pointerUp({button: actions.ButtonType.LEFT})
       .send();
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-1.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-1.html
index 50933da2c1..3645279d61 100644
--- a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-1.html
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-1.html
@@ -9,7 +9,7 @@
     window.log = [];
 
     window.addEventListener("error", ev => log.push(ev.error));
-    window.addEventListener("onunhandledrejection", unreachable);
+    window.addEventListener("unhandledrejection", unreachable);
 
     const test_load = async_test(
         "Parse errors in different files should be reported " +
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-2.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-2.html
index 51adb09d11..d40aaba8df 100644
--- a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-2.html
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-2.html
@@ -9,7 +9,7 @@
     window.log = [];
 
     window.addEventListener("error", ev => log.push(ev.error));
-    window.addEventListener("onunhandledrejection", unreachable);
+    window.addEventListener("unhandledrejection", unreachable);
 
     const test_load = async_test(
         "Instantiation errors in different files should be reported " +
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-3.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-3.html
index bc52119bfe..2d74af864b 100644
--- a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-3.html
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/choice-of-error-3.html
@@ -9,7 +9,7 @@
     window.log = [];
 
     window.addEventListener("error", ev => log.push(ev.error));
-    window.addEventListener("onunhandledrejection", unreachable);
+    window.addEventListener("unhandledrejection", unreachable);
 
     const test_load = async_test(
         "Evaluation errors are cached in intermediate module scripts");
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-1.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-1.html
index 2480a60d6d..0484b614ab 100644
--- a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-1.html
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-1.html
@@ -9,7 +9,7 @@
     window.log = [];
 
     window.addEventListener("error", ev => log.push(ev.error));
-    window.addEventListener("onunhandledrejection", unreachable);
+    window.addEventListener("unhandledrejection", unreachable);
 
     const test_load = async_test(
         "network error has higher priority than parse error");
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-2.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-2.html
index 673bf28ca2..7303a838a5 100644
--- a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-2.html
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-2.html
@@ -9,7 +9,7 @@
     window.log = [];
 
     window.addEventListener("error", ev => log.push(ev.error));
-    window.addEventListener("onunhandledrejection", unreachable);
+    window.addEventListener("unhandledrejection", unreachable);
 
     const test_load = async_test(
         "parse error has higher priority than instantiation error");
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-3.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-3.html
index 8a16266f4c..f80f74cbe4 100644
--- a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-3.html
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/error-type-3.html
@@ -9,7 +9,7 @@
     window.log = [];
 
     window.addEventListener("error", ev => log.push(ev.error));
-    window.addEventListener("onunhandledrejection", unreachable);
+    window.addEventListener("unhandledrejection", unreachable);
 
     const test_load = async_test(
         "instantiation error has higher priority than evaluation error");
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-1.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-1.html
index 3f2bb35f4e..b12d178fb5 100644
--- a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-1.html
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-1.html
@@ -9,7 +9,7 @@
     window.log = [];
 
     window.addEventListener("error", ev => log.push(ev.error));
-    window.addEventListener("onunhandledrejection", unreachable);
+    window.addEventListener("unhandledrejection", unreachable);
 
     const test_load = async_test(
         "Test that exceptions during evaluation lead to error events on " +
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-2.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-2.html
index 4f2b3c5a74..a890ca6457 100644
--- a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-2.html
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-2.html
@@ -9,7 +9,7 @@
     window.log = [];
 
     window.addEventListener("error", ev => log.push(ev.error));
-    window.addEventListener("onunhandledrejection", unreachable);
+    window.addEventListener("unhandledrejection", unreachable);
 
     const test_load = async_test(
         "Test that ill-founded cyclic dependencies cause ReferenceError " +
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-3.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-3.html
index 9bfb5df2cf..4062bc8a3a 100644
--- a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-3.html
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-3.html
@@ -9,7 +9,7 @@
     window.log = [];
 
     window.addEventListener("error", ev => log.push(ev.error));
-    window.addEventListener("onunhandledrejection", unreachable);
+    window.addEventListener("unhandledrejection", unreachable);
 
     const test_load = async_test(
         "Test that exceptions during evaluation lead to error events on " +
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-4.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-4.html
index 0b4b7d1662..256aea508e 100644
--- a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-4.html
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/module/evaluation-error-4.html
@@ -9,7 +9,7 @@
     window.log = [];
 
     window.addEventListener("error", ev => log.push(ev.error));
-    window.addEventListener("onunhandledrejection", unreachable);
+    window.addEventListener("unhandledrejection", unreachable);
 
     const test_load = async_test(
         "Test that exceptions during evaluation lead to error events on " +
diff --git a/testing/web-platform/tests/html/semantics/text-level-semantics/the-bdi-element/bdi-auto-dir-default.html b/testing/web-platform/tests/html/semantics/text-level-semantics/the-bdi-element/bdi-auto-dir-default.html
index 3a9d90c76b..e658500a4e 100644
--- a/testing/web-platform/tests/html/semantics/text-level-semantics/the-bdi-element/bdi-auto-dir-default.html
+++ b/testing/web-platform/tests/html/semantics/text-level-semantics/the-bdi-element/bdi-auto-dir-default.html
@@ -30,13 +30,13 @@
         &#x202D; - The LRO (left-to-right override) formatting character.
         &#x202C; - The PDF (pop directional formatting) formatting character; closes LRO.
       In each DIV of the test:
-        - the first BDI, having no characters with strong direction, should inherit the parent direction;
+        - the first BDI, having no characters with strong direction, should be LTR by default;
         - the second BDI, having an LTR character first, should be LTR by default;
         - the third BDI, having an RTL character first, should be RTL by default.
     </div>
     <div class="test">
       <div dir="ltr"><bdi>[:)]</bdi>, <bdi>[+- a &#x05D1;]</bdi>, <bdi>[1 &#x05D2; d]</bdi>...</div>
-      <div dir="rtl"><bdi>[(:]</bdi>, <bdi>[+- a &#x05D1;]</bdi>, <bdi>[1 &#x05D2; d]</bdi>...</div>
+      <div dir="rtl"><bdi>[:)]</bdi>, <bdi>[+- a &#x05D1;]</bdi>, <bdi>[1 &#x05D2; d]</bdi>...</div>
     </div>
     <div class="ref">
       <div dir="ltr">&#x202D;[:)], [+- a &#x05D1;], [d &#x05D2; 1]...&#x202C;</div>
-- 
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