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Test Info:

<!DOCTYPE html>
<title>Target element of ElementsInternals is held strongly and doesn't get GCed if there are no other references</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/gc.js"></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" });
await garbageCollect();
await new Promise(r => t.step_timeout(r, 100));
const allShadowRootsAreAlive = elementInternals.every(eI => eI.shadowRoot instanceof ShadowRoot);