event-dispatch-shadow.html

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<!doctype html>

<meta charset="utf-8" />

<meta name="author" title="Keith Cirkel" href="mailto:wpt@keithcirkel.co.uk" />

<link rel="help" href="https://open-ui.org/components/invokers.explainer/" />

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

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

<script src="resources/invoker-utils.js"></script>

<body>

<script>

  test(function (t) {

    const host = document.createElement("div");

    document.body.append(host);

    t.add_cleanup(() => host.remove());

    const shadow = host.attachShadow({ mode: "open" });

    const button = shadow.appendChild(document.createElement("button"));

    const invokee = host.appendChild(document.createElement("div"));

    button.commandForElement = invokee;

    button.command = '--test-command';

    let event = null;

    let eventTarget = null;

    let eventSource = null;

    invokee.addEventListener(

      "command",

      (e) => {

        event = e;

        eventTarget = e.target;

        eventSource = e.source;

},

      { once: true },

);

    button.click();

    assert_true(event instanceof CommandEvent);

    assert_equals(event.composed, false, "composed is false");

    assert_equals(eventTarget, invokee, "target is invokee");

    assert_equals(eventSource, host, "source is host");

  }, "cross shadow CommandEvent retargets source to host element");

</script>

</body>