fire-selectionchange-event-on-document-if-textcontrol-element-is-in-shadow-tree.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /selection/fire-selectionchange-event-on-document-if-textcontrol-element-is-in-shadow-tree.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Selectionchange event fired on document if TextControl element is in Shadow Tree</title>

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

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

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

<script>

    const root = document.getElementById("root");

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

    const element = document.createElement("input");

    element.value = "hello";

    shadow.append(element);

    const events_on_document = [];

    document.addEventListener("selectionchange", ev => {

        events_on_document.push(ev);

});

    const events_on_input = [];

    element.addEventListener("selectionchange", ev => {

        events_on_input.push(ev);

});

    promise_test(async () => {

        element.focus();

        element.setSelectionRange(5, 5);

        await new Promise(resolve => step_timeout(resolve, 500));

        events_on_document.length = 0;

        events_on_input.length = 0;

        document.execCommand("delete");

        // Waits a short time to allow any events to be processed.

        await new Promise(resolve => step_timeout(resolve, 500));

        const expectedValue = "hell";

        assert_equals(element.value, expectedValue, "element.value should be " + expectedValue);

        //selectionchange event should not fire on input element

        assert_equals(events_on_input.length, 0);

        //selectionchange event should fire on the document

        assert_equals(events_on_document.length, 1);

        assert_equals(events_on_document[0].target, document, "Event target should be the document");

    }, "selectionchange event fired on the document in case TextControl element is in Shadow Tree");

</script>