ElementInternals-target-element-is-held-strongly.html

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This WPT test may be referenced by the following Test IDs:
- /custom-elements/form-associated/ElementInternals-target-element-is-held-strongly.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Target element of ElementsInternals is held strongly and doesn't get GCed if there are no other references</title>

<meta name="timeout" content="long">

<body>

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

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

<script src="/common/gc.js"></script>

<script>

customElements.define("x-foo", class extends HTMLElement {});

promise_test(async t => {

    const elementInternals = [];

    for (let i = 0; i < 1e5; i++) {

        const targetElement = document.createElement("x-foo");

        targetElement.attachShadow({ mode: "open" });

        elementInternals.push(targetElement.attachInternals());

    await garbageCollect();

    await new Promise(r => t.step_timeout(r, 100));

    const allShadowRootsAreAlive = elementInternals.every(eI => eI.shadowRoot instanceof ShadowRoot);

    assert_true(allShadowRootsAreAlive);

});

</script>