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Tests: Add getElementById mutation and shadow-root routing tests

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Add focused coverage for the ElementByIdMap that is easy to regress
while optimizing lookup paths.

The dynamic mutations test verifies duplicate id tree order semantics
remain correct after reordering, id changes, removals, and
reintroduction.

The shadow root routing test verifies lookups stay routed to the correct
scope when an element with an id is removed and moved across shadow
roots and into the document.
This commit is contained in:
Aliaksandr Kalenik
2026-02-21 12:38:45 +01:00
committed by Andreas Kling
parent 7cc973fa77
commit a0768e9bac
Notes: github-actions[bot] 2026-02-21 12:56:57 +00:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/LadybirdBrowser/ladybird/commit/a0768e9bac6
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8055
4 changed files with 67 additions and 0 deletions
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Tests/LibWeb/Text/input/DOM/getElementById-dynamic-mutations.html Normal file
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<!DOCTYPE html>
<script src="../include.js"></script>
<div id="foo" data-name="first"></div>
<div id="foo" data-name="second"></div>
<script>
test(() => {
let [first, second] = document.querySelectorAll("[id='foo']");
println(`initial: ${document.getElementById("foo").dataset.name}`);
document.body.insertBefore(second, first);
println(`after reorder: ${document.getElementById("foo").dataset.name}`);
first.id = "bar";
println(`after first id change: ${document.getElementById("foo").dataset.name}`);
second.remove();
println(`after removing second: ${document.getElementById("foo")}`);
first.id = "foo";
println(`after restoring first: ${document.getElementById("foo") === first}`);
});
</script>