File: custom-state-set-strong-ref.html

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="timeout" content="long">
    <meta name="author" title="Keith Cirkel" href="mailto:wpt@keithcirkel.co.uk" />
    <link rel="help" href="https://html.spec.whatwg.org/multipage/custom-elements.html#custom-state-pseudo-class" />
    <title>CustomStateSet doesn't crash after GC on detached node</title>

    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="/common/gc.js"></script>
  </head>
  <body>
    <custom-state id="myCE"></custom-state>
    <script>
    customElements.define('custom-state', class extends HTMLElement {
      connectedCallback() {
        this.elementInternals = this.attachInternals();
      }
    });

    promise_test(async function() {
      const states = myCE.elementInternals.states;
      myCE.remove();
      await garbageCollect();
      states.add('still-works');
      assert_equals(states.size, 1);
      assert_true(states.delete('still-works'));
      assert_equals(states.size, 0);
    }, "customstateset doesn't crash after GC on detached node");
    </script>
  </body>
</html>