test_inline_style_cc.html

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<!doctype html>

<meta charset="utf-8">

<title>Inline style declarations trace their gray wrappers</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

<script>

function makeAnchor() {

  const doc = new DOMParser().parseFromString(

    "<!doctype html><body>",

    "text/html"

);

  const element = doc.createElement("div");

  element.appendChild(doc.createElement("span"));

  const victim = doc.createRange();

  victim.selectNodeContents(element);

  // Preserve the victim's reflector so it is also a gray JS holder.

  victim.expando = true;

  element.style.victim = victim;

  // Retain the carrier only through the native edges of a JS-rooted Range.

  const anchor = doc.createRange();

  anchor.selectNodeContents(element);

  return anchor;

add_task(function() {

  const anchor = makeAnchor();

  SpecialPowers.forceGC();

  SpecialPowers.forceCC();

  // Expose the element, but not its style. The first CC has already run the

  // early forgetSkippable passes, so the style reflector is still gray.

  const element = anchor.startContainer;

  SpecialPowers.forceCC();

  // A premature unlink of the still-reachable Range clears its boundaries.

  is(element.style.victim.collapsed, false, "The style expando must stay alive");

});

</script>