fire-selectionchange-event-on-textcontrol-element-on-pressing-backspace.html

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This WPT test may be referenced by the following Test IDs:
- /selection/fire-selectionchange-event-on-textcontrol-element-on-pressing-backspace.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Test selectionchange event fired on Text Control element</title>

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

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

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

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

<input id="input" type="text" value="hello">

<script>

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

    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;

        assert_equals(element.selectionStart, 5, "selectionStart before pressing backspace key");

        assert_equals(element.selectionEnd, 5, "selectionEnd before pressing backspace key");

        await new test_driver.send_keys(element, "\uE003");

        assert_equals(element.selectionStart, 4, "selectionStart after pressing backspace key");

        assert_equals(element.selectionEnd, 4, "selectionEnd after pressing backspace key");

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

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

        assert_equals(events_on_input.length, 1);

        //selectionchange event fired on a text control should bubble to the document

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

        assert_equals(events_on_document.length, 1);

    }, "selectionchange event fired on an input element");

</script>