File: host-is-featureless.html

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<!DOCTYPE html>
<title>CSS Scoping: Shadow host is featureless</title>
<link rel="help" href="https://drafts.csswg.org/css-scoping/#host-element-in-tree">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="host">
  <template shadowrootmode="open">
    <style>
      div {
        --x:FAIL;
      }
    </style>
  </template>
</div>
<script>
  test(() => {
    assert_equals(getComputedStyle(host).getPropertyValue('--x'), '');
  });
</script>