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[Manual] WebKit Export https://bugs.webkit.org/show_bug.cgi?id=271360 #56769

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Merged
Ahmad-S792 merged 1 commit into from
Dec 16, 2025
Merged

[Manual] WebKit Export https://bugs.webkit.org/show_bug.cgi?id=271360 #56769

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34 changes: 31 additions & 3 deletions css/css-highlight-api/HighlightRegistry-maplike-tampered-Map-prototype.html
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Original file line number Diff line number Diff line change
Expand Up @@ -3,8 +3,6 @@
<link rel="help" href="https://drafts.csswg.org/css-highlight-api-1/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<body>
<script>
"use strict";

Expand All @@ -25,11 +23,38 @@
Object.freeze(Map.prototype);
}

function restoreMapPrototype(originalDescriptors) {
// Create a new object with the original descriptors
const newProto = Object.create(Object.prototype);

for (const [key, descriptor] of Object.entries(originalDescriptors)) {
if (descriptor) {
Object.defineProperty(newProto, key, descriptor);
}
}
// Replace the frozen prototype with the restored one
Object.setPrototypeOf(Map, newProto);
}

test(() => {
const originalDescriptors = {
size: Object.getOwnPropertyDescriptor(Map.prototype, 'size'),
entries: Object.getOwnPropertyDescriptor(Map.prototype, 'entries'),
forEach: Object.getOwnPropertyDescriptor(Map.prototype, 'forEach'),
get: Object.getOwnPropertyDescriptor(Map.prototype, 'get'),
has: Object.getOwnPropertyDescriptor(Map.prototype, 'has'),
keys: Object.getOwnPropertyDescriptor(Map.prototype, 'keys'),
values: Object.getOwnPropertyDescriptor(Map.prototype, 'values'),
[Symbol.iterator]: Object.getOwnPropertyDescriptor(Map.prototype, Symbol.iterator),
clear: Object.getOwnPropertyDescriptor(Map.prototype, 'clear'),
delete: Object.getOwnPropertyDescriptor(Map.prototype, 'delete'),
set: Object.getOwnPropertyDescriptor(Map.prototype, 'set')
};

tamperMapPrototype();

const highlight = new Highlight(new StaticRange({startContainer: document.body, endContainer: document.body, startOffset: 0, endOffset: 0}));
const highlightRegistry = new HighlightRegistry();
const highlightRegistry = CSS.highlights;

assert_equals(highlightRegistry.size, 0);
highlightRegistry.set("foo", highlight);
Expand Down Expand Up @@ -57,5 +82,8 @@
let callbackCalled = false;
highlightRegistry.forEach(() => { callbackCalled = true; });
assert_true(callbackCalled);

highlightRegistry.clear();
restoreMapPrototype(originalDescriptors);
}, "HighlightRegistry is a maplike interface that works as expected even if Map.prototype is tampered.");
</script>