File: test_custom_content_inheritance.html

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<!doctype html>
<title>Test for custom content inheritance</title>
<style>
  html { color: red !important; }
</style>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script>
onload = function() {
  let doc = SpecialPowers.wrap(document);
  let div = doc.createElement('div');
  div.id = "test-id";
  ok(!!doc.insertAnonymousContent,
     "Must have the insertAnonymousContent API");
  let content = doc.insertAnonymousContent();
  ok(!!content, "Must have anon content");
  content.root.appendChild(div);
  let color = SpecialPowers.wrap(window).getComputedStyle(div).color;
  ok(!!color, "Should be able to get a color");
  isnot(color, getComputedStyle(document.documentElement).color,
        "Custom anon content shouldn't inherit from the root element");
  SimpleTest.finish();
};
SimpleTest.waitForExplicitFinish();
</script>