File: quirks-mode-import.html

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<!DOCTYPE html>
<html>
  <head>
    <title>Importing quirks mode element into standards mode document</title>
    <link rel="help" href="https://crbug.com/416619318">
    <style>
       div { color: green; }
       :not(.Foo) { color: red; }
    </style>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
  </head>
  <div id="elem1" class="Foo">This text should be green</div>
  <div id="container"></div>
  <script>
    test(() => {
      let doc = (new DOMParser()).parseFromString('<div><div id="elem2" class="Foo">This text should be green</div></div>', 'text/html');
      let subdiv = doc.documentElement.firstChild.nextSibling.firstChild;
      document.querySelector('#container').appendChild(document.importNode(subdiv, true));

      assert_equals(getComputedStyle(document.querySelector('#elem1')).color, 'rgb(0, 128, 0)');
      assert_equals(getComputedStyle(document.querySelector('#elem2')).color, 'rgb(0, 128, 0)');
    });
  </script>
</html>