wpt/css/css-scoping/has-slotted-changing-001.tentative.html at 1059422a6efdd73dfa6f097a72020766d26ce018 · web-platform-tests/wpt · GitHub

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<!DOCTYPE HTML>
<html>

<head>
  <meta charset="utf-8">
  <title>Changing content targetting :has-slotted through a single shadow root</title>
  <link rel="help" href="https://github.com/w3c/csswg-drafts/pull/10586">
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="/resources/testdriver.js"></script>
  <script src="/resources/testdriver-vendor.js"></script>
  <script src="/resources/testdriver-actions.js"></script>
</head>

<body>

  <div id="test"><template shadowrootmode="open">
    <slot></slot>
    <p id="target">This text will be styled.</p>
    <style>
      p {
        color: rgb(0 255 0);
      }
      slot:not(:has-slotted) + p {
        color: rgb(0 0 255);
      }
    </style>
  </template></div>

  <script>
    const blue = 'rgb(0, 0, 255)';
    const green = 'rgb(0, 255, 0)';
    test(function (t) {
      const test = document.getElementById('test');
      const target = test.shadowRoot.getElementById('target');
      t.add_cleanup(() => { test.innerHTML = '' });
      let styles = getComputedStyle(target);
      assert_equals(styles.getPropertyValue('color'), blue);
    }, "empty node is blue");

    test(function (t) {
      const test = document.getElementById('test');
      const target = test.shadowRoot.getElementById('target');
      test.innerHTML = ' ';
      t.add_cleanup(() => { test.innerHTML = '' });
      styles = getComputedStyle(target);
      assert_equals(styles.getPropertyValue('color'), green);
      test.innerHTML = '';
      styles = getComputedStyle(target);
      assert_equals(styles.getPropertyValue('color'), blue);
    }, "setting innerHTML to whitespace invalidates and becomes green, then empty string becomes blue");

    test(function (t) {
      const test = document.getElementById('test');
      const target = test.shadowRoot.getElementById('target');
      test.replaceChildren(document.createElement('div'));
      assert_equals(styles.getPropertyValue('color'), green);
      test.replaceChildren();
      styles = getComputedStyle(target);
      assert_equals(styles.getPropertyValue('color'), blue);
    }, "calling replaceChildren invalidates and becomes green, emptying with replaceChildren becomes blue");

    test(function (t) {
      const test = document.getElementById('test');
      const target = test.shadowRoot.getElementById('target');
      const div = document.createElement('div');
      test.innerHTML = '';
      test.append(div);
      t.add_cleanup(() => { test.innerHTML = '' });
      styles = getComputedStyle(target);
      assert_equals(styles.getPropertyValue('color'), green);
    }, "calling append invalidates and becomes green");

    test(function (t) {
      const test = document.getElementById('test');
      const target = test.shadowRoot.getElementById('target');
      const node = document.createTextNode(' ');
      test.replaceChildren(node);
      t.add_cleanup(() => { test.innerHTML = '' });
      styles = getComputedStyle(target);
      assert_equals(styles.getPropertyValue('color'), green);
      test.replaceChildren();
      styles = getComputedStyle(target);
      assert_equals(styles.getPropertyValue('color'), blue);
    }, "calling replaceChildren(textnode) invalidates and becomes green");
  </script>
</body>

</html>