is-where-shadow.html

Enable keyboard shortcuts

This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /css/selectors/is-where-shadow.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>:is() inside shadow pseudos</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<link rel="help" href="https://drafts.csswg.org/selectors-4/#matches">

<link rel="help" href="https://drafts.csswg.org/css-scoping/#host-selector">

<link rel="help" href="https://drafts.csswg.org/css-scoping/#slotted-pseudo">

<div class="parent1"><div id="host1" class=a><p class=e>::slotted</p></div></div>

<div class="parent2"><div id="host2" class=b><p class=d>::slotted</p></div></div>

<div class="parent3"><div id="host3" class=c><p class=f>::slotted</p></div></div>

</div>

<script>

  let shadow1 = host1.attachShadow({ mode: 'open' });

  let shadow2 = host2.attachShadow({ mode: 'open' });

  let shadow3 = host3.attachShadow({ mode: 'open' });

  const html = `

    <style>

      * { color: blue; }

      :host(:is(.a, .b)) b { color: green; }

      :host-context(:is(.parent1, .parent2)) i { color: green; }

      ::slotted(:is(.e, .f)) { color: green; }

      /* The following should not match: */

      :host(:is(.z)) b { color: red; }

      :host(:is(.a + .b)) b { color: red; }

      :host-context(:is(.z)) i { color: red; }

      :host-context(:is(.parent1 .parent2)) i { color: red; }

      ::slotted(:is(.z)) { color: red; }

      ::slotted(:is(.a > .b)) { color: red; }

    </style>

    <b>:host</b>

    <i>:host-context</i>

    <slot></slot>

`;

  shadow1.innerHTML = html;

  shadow2.innerHTML = html;

  shadow3.innerHTML = html;

  const getComputedColor = e => getComputedStyle(e).color;

  const green = 'rgb(0, 128, 0)';

  const blue = 'rgb(0, 0, 255)';

  test(function() {

    assert_equals(getComputedColor(shadow1.querySelector('b')), green);

    assert_equals(getComputedColor(shadow2.querySelector('b')), green);

    assert_equals(getComputedColor(shadow3.querySelector('b')), blue);

  }, ':is() inside :host()');

  test(function() {

    assert_equals(getComputedColor(shadow1.querySelector('i')), green);

    assert_equals(getComputedColor(shadow2.querySelector('i')), green);

    assert_equals(getComputedColor(shadow3.querySelector('i')), blue);

  }, ':is() inside :host-context()');

  test(function() {

    assert_equals(getComputedColor(document.querySelector('.e')), green);

    assert_equals(getComputedColor(document.querySelector('.d')), blue);

    assert_equals(getComputedColor(document.querySelector('.f')), green);

  }, ':is() inside ::slotted()');

</script>