invokeevent-dispatch-shadow.tentative.html

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/semantics/invokers/invokeevent-dispatch-shadow.tentative.html - WPT Dashboard Interop Dashboard

<!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/testdriver.js"></script>

<script src="/resources/testdriver-actions.js"></script>

<script src="/resources/testdriver-vendor.js"></script>

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

<div id="div"></div>

<button id="button"></button>

<script>

  test(function () {

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

    const child = host.appendChild(document.createElement("p"));

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

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

    let childEvent = null;

    let childEventTarget = null;

    let childEventSource = null;

    let hostEvent = null;

    let hostEventTarget = null;

    let hostEventSource = null;

    slot.addEventListener(

      "command",

      (e) => {

        childEvent = e;

        childEventTarget = e.target;

        childEventSource = e.source;

},

      { once: true },

);

    host.addEventListener(

      "command",

      (e) => {

        hostEvent = e;

        hostEventTarget = e.target;

        hostEventSource = e.source;

},

      { once: true },

);

    const event = new CommandEvent("command", {

      bubbles: true,

      source: slot,

      composed: true,

});

    slot.dispatchEvent(event);

    assert_true(childEvent instanceof CommandEvent, "slot saw invoke event");

    assert_equals(

      childEventTarget,

      slot,

      "target is child inside shadow boundary",

);

    assert_equals(

      childEventSource,

      slot,

      "source is child inside shadow boundary",

);

    assert_equals(

      hostEvent,

      childEvent,

      "event dispatch propagates across shadow boundary",

);

    assert_equals(

      hostEventTarget,

      host,

      "target is retargeted to shadowroot host",

);

    assert_equals(

      hostEventSource,

      host,

      "source is retargeted to shadowroot host",

);

  }, "CommandEvent propagates across shadow boundaries retargeting source");

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

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

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

</script>