File: defined-in-has.html

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<!DOCTYPE html>
<title>:has() invalidation with :defined pseudo-class</title>
<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
<link rel="help" href="https://drafts.csswg.org/selectors/#relational">
<link rel="help" href="https://html.spec.whatwg.org/multipage/semantics-other.html#selector-defined">
<style>
  #subject {
    background-color: red;
    width: 100px;
    height: 100px;
  }
  #subject:has(:defined) {
    background-color: green;
  }
</style>
<body>
  Test :defined pseudo-class invalidation with :has()
  <div id="subject">
    <my-element></my-element>
  </div>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script>
    const GREEN = "rgb(0, 128, 0)";
    const RED = "rgb(255, 0, 0)";

    function assert_matches_defined(defined) {
      assert_equals(getComputedStyle(subject).backgroundColor, defined ? GREEN : RED);
    }

    test(() => {
      assert_matches_defined(false);
      customElements.define("my-element", class MyElement extends HTMLElement { });
      assert_matches_defined(true);
    }, "Test :has() invalidation with :defined pseudo-class");
  </script>
</body>