DOM: Suppress mutation events during moveBefore()

[email protected] Bug: 40150299 Change-Id: I70dffea4c1c81c5a12285949b7112624f7e3ff8a Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5797545 Reviewed-by: Mason Freed <[email protected]> Commit-Queue: Dominic Farolino <[email protected]> Cr-Commit-Position: refs/heads/main@{#1343986}
web-platform-tests · Aug 20, 2024 · 2eb5c22 · 2eb5c22
1 parent 6bfec39
commit 2eb5c22
Showing 1 changed file with 20 additions and 0 deletions.
diff --git a/dom/nodes/moveBefore/tentative/mutation-events.html b/dom/nodes/moveBefore/tentative/mutation-events.html
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+<!DOCTYPE html>
+<title>Mutation events are suppressed during moveBefore()</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<body>
+<p id=reference>reference</p>
+<p id=target>target</p>
+
+<script>
+  const reference = document.querySelector('#reference');
+  const target = document.querySelector('#target');
+
+  test(() => {
+    target.addEventListener('DOMNodeInserted', () => assert_unreached('DOMNodeInserted not called'));
+    target.addEventListener('DOMNodeRemoved', () => assert_unreached('DOMNodeRemoved not called'));
+    document.body.moveBefore(target, reference);
+  }, "MutationEvents (if supported by the UA) are suppressed during `moveBefore()`");
+</script>
+</body>