CSSStyleSheet-constructable-cssRules.html

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This WPT test may be referenced by the following Test IDs:
- /css/cssom/CSSStyleSheet-constructable-cssRules.html - WPT Dashboard Interop Dashboard

<!doctype html>

<meta charset="utf-8">

<title>CSSStyleSheet.replace/replaceSync() doesn't change cssRules object</title>

<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">

<link rel="author" href="https://mozilla.org" title="Mozilla">

<link rel="help" href="https://drafts.csswg.org/cssom/#extensions-to-the-document-or-shadow-root-interface">

<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1752392">

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<span>Should be green</span>

<script>

promise_test(async function() {

  const sheet = new CSSStyleSheet();

  let rules = sheet.cssRules;

  sheet.replaceSync('span {color:blue;}');

  assert_equals(rules, sheet.cssRules, "Rules should be the same after replaceSync");

  await sheet.replace('span {color: lime;}');

  assert_equals(rules, sheet.cssRules, "Rules should be the same after replace()");

  document.adoptedStyleSheets = [sheet];

  assert_equals(getComputedStyle(document.querySelector("span")).color, "rgb(0, 255, 0)", "Sheet should apply");

}, "cssRules doesn't change on replace / replaceSync");

</script>