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script: Empty pending mutation observers when notifying mutation observers (#39456)

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Empty the surrounding agent’s pending mutation observers when notifying
mutation observers according to the spec. Also, the code in the method
MutationObserver::queue_a_mutation_record and the corresponding
specification have diverged over the years. These changes bring the code
into conformity with the specification.

Testing: Added a new crash test
Fixes: #39434 #39531

---------

Signed-off-by: Rodion Borovyk <rodion.borovyk@gmail.com>
This commit is contained in:
Rodion Borovyk 2025-09-29 16:15:07 +02:00 • committed by GitHub
parent e64f021550
commit 5b1fe60277
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4 changed files with 74 additions and 42 deletions
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7
tests/wpt/meta/MANIFEST.json vendored
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@ -6984,6 +6984,13 @@
{}
]
],
"MutationObserver-nested-crash.html": [
"0648c2037c8b2602ac77abde62f60793f0855a45",
[
null,
{}
]
],
"Node-cloneNode-on-inactive-document-crash.html": [
"cbd7a1e6a500e5671c1e0a71c5dcb963cab727ba",
[

13
tests/wpt/tests/dom/nodes/MutationObserver-nested-crash.html vendored Normal file
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@ -0,0 +1,13 @@
<!DOCTYPE html>
<meta charset=utf-8>
<title>MutationObservers: observer inside another observer's callback</title>
<div id="target"></div>
<script>
var observer = new MutationObserver(_ => {
var otherObserver = new MutationObserver(_ => {});
otherObserver.observe(target, {characterData: true});
});
observer.observe(target, {subtree: true, attributeOldValue: true});
target.setAttribute("foo", "bar");
</script>