2038439.html - mozsearch

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<!DOCTYPE html>

<html class="reftest-wait">

<meta charset="utf-8">

<body>

<script>

onload = () => {

  let host = document.createElement("div");

  document.body.appendChild(host);

  let sr = host.attachShadow({ mode: "open" });

  let proxy = sr.adoptedStyleSheets;

  host.remove();

  sr = null;

  host = null;

  // Trigger the unlinking of ShadowRoot, but the JS reflector is not yet

  // collected.

  SpecialPowers.forceShrinkingGC();

  SpecialPowers.forceCC();

  let sheet = new CSSStyleSheet();

  sheet.replaceSync("div { color: red; }");

  proxy.push(sheet);

  // Force GC and CC

  SpecialPowers.forceShrinkingGC();

  SpecialPowers.forceCC();

  sheet.insertRule("p { margin: 0; }", 0);

  document.documentElement.classList.remove("reftest-wait");

};

</script>

</body>

</html>