inserting-fragment-under-shadow-host.html

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This WPT test may be referenced by the following Test IDs:
- /shadow-dom/inserting-fragment-under-shadow-host.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<body>

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

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

<script>

promise_test(() => {

    const host = document.createElement('span');

    document.body.appendChild(host);

    const shadowRoot = host.attachShadow({mode: 'closed'});

    shadowRoot.innerHTML = '<slot></slot>';

    let slotchangeDidFire = false;

    shadowRoot.querySelector('slot').addEventListener('slotchange', () => slotchangeDidFire = true);

    host.innerHTML = '<span slot="unused"></span>b<span slot="unused"></span>';

    return new Promise((resolve) => {

        queueMicrotask(() => {

            assert_true(slotchangeDidFire);

            host.remove();

            resolve();

});

})

}, 'This tests inserting a document fragment with a mixture of elements and text nodes, which should dispatch a `slotchange` event.');

</script>

</body>

</html>