Blitz - WPT: focus-visible-020.html

wpt / css / selectors / focus-visible-020.html
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<!DOCTYPE html>
<meta charset="utf-8" />
<title>CSS Test (Selectors): :focus-visible doesn't match on ShadowRoot</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
<link rel="help" href="https://drafts.csswg.org/selectors-4/#the-focus-visible-pseudo" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<style>
  #warning {
    display: none;
    background: red;
  }

  @supports not selector(:focus-visible) {
    #instructions {
      display: none;
    }

    #warning {
      display: block;
    }
  }

  #host:focus-visible {
    outline: 0;
    background-color: red;
  }
</style>

<p>This test checks that <code>:focus-visible</code> doesn't math on ShadowRoot.</p>
<ol id="instructions">
  <li>The input should be focused on load, if it's not focused, focus it via mouse or keyboard.</li>
  <li>If you see no red the test result is SUCCESS.</li>
</ol>
<p id="warning">Your user-agent does not support <code>:focus-visible</code> pseudo-class, please SKIP this test.</p>

<div id="host" style="height: 100px;"></div>

<script>
  const shadowRoot = host.attachShadow({mode: 'open', delegatesFocus: true});
  shadowRoot.innerHTML = '<input id="target" autofocus value="Focus me">';

  // Check that :focus-visible is supported.
  test_valid_selector(':focus-visible');

  async_test((t) => {
    host.focus();
    window.requestAnimationFrame(t.step_func_done(() => {
      assert_not_equals(getComputedStyle(host).backgroundColor, "rgb(255, 0, 0)", `backgroundColor for ${host.tagName}#${host.id} should NOT be red`);

      let focusVisiblePseudoAll = document.querySelectorAll(':focus-visible');
      assert_equals(focusVisiblePseudoAll.length, 0, "No element matches ':focus-visible'");

      let focusVisibleShadowDOMPseudoAll = shadowRoot.querySelectorAll(':focus-visible');
      assert_equals(focusVisibleShadowDOMPseudoAll.length, 1, "Only one element matches ':focus-visible' in the Shadow DOM");

      let target = shadowRoot.getElementById("target");
      assert_equals(target, focusVisibleShadowDOMPseudoAll[0], "${target.tagName}#${target.id} matches ':focus-visible'");
    }));
  }, ":focus-visible doesn't match on ShadowRoot");
</script>