Emilio Cobos Álvarez
06979f0bbc
If CSSStyleSheet becomes a thenable due to prototype mutations, then we might null out the wrong promise. Differential Revision: https://phabricator.services.mozilla.com/D284391
44 lines
1.3 KiB
HTML
44 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<meta charset="utf-8">
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<title>CSSStyleSheet.replace/replaceSync() when stylesheet is a thenable</title>
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<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
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<link rel="author" href="https://mozilla.org" title="Mozilla">
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<link rel="help" href="https://drafts.csswg.org/cssom/#extensions-to-the-document-or-shadow-root-interface">
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=2016237">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script>
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promise_test(async function() {
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const sheet = new CSSStyleSheet();
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document.adoptedStyleSheets = [sheet];
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let p2 = null;
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let once = false;
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Object.defineProperty(CSSStyleSheet.prototype, "then", {
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configurable: true,
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get() {
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if (!once) {
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once = true;
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p2 = sheet.replace("b { color: blue; }");
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}
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return undefined;
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},
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});
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await sheet.replace("a { color: red; }");
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delete CSSStyleSheet.prototype.then;
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assert_true(once, "Then getter was called");
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await p2;
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assert_true(true, "replace() from then() should settle");
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// Check if sheet is still modifiable
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sheet.replaceSync("c {}");
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assert_equals(sheet.cssRules[0].selectorText, "c", "Sheet should still be modifiable");
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});
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</script>
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