<!DOCTYPE html>
<meta charset="utf-8">
<meta name="flags" content="dom">
<title>CSS Test: CSSOM View MediaQueryListEvent</title>
<link rel="help" href="https://www.w3.org/TR/cssom-view-1/#mediaquerylistevent">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/matchMedia.js"></script>
<div id="log"></div>
<script>
"use strict";

test(() => {
    assert_equals(new MediaQueryListEvent("test").type, "test");
}, 'type can be different from "change"');

test(() => {
    const event = new MediaQueryListEvent("change");

    assert_equals(event.media, "");
    assert_false(event.matches);
    assert_false(event.bubbles);
    assert_false(event.cancelable);
}, "init dictionary default values");

test(() => {
    const event = new MediaQueryListEvent("change", {
        media: "test",
        matches: true,
        bubbles: true,
        cancelable: true,
    });

    assert_equals(event.media, "test");
    assert_true(event.matches);
    assert_true(event.bubbles);
    assert_true(event.cancelable);
}, "init dictionary overrides");

promise_test(async t => {
    const mql = await createMQL(t);

    let _event;
    mql.addListener(event => {
        _event = event;
    });

    triggerMQLEvent(mql);
    await waitForChangesReported();

    assert_true(_event instanceof getWindow(mql).MediaQueryListEvent);
    assert_equals(_event.type, "change");
    assert_false(_event.bubbles);
    assert_false(_event.cancelable);
}, "argument of addListener");

promise_test(async t => {
    const mql = await createMQL(t);

    let _event;
    mql.onchange = event => {
        _event = event;
    };

    triggerMQLEvent(mql);
    await waitForChangesReported();

    assert_true(_event instanceof getWindow(mql).MediaQueryListEvent);
    assert_equals(_event.type, "change");
    assert_false(_event.bubbles);
    assert_false(_event.cancelable);
}, "argument of onchange");

promise_test(async t => {
    const mql = await createMQL(t);

    let _event;
    mql.addEventListener("change", event => {
        _event = event;
    });

    triggerMQLEvent(mql);
    await waitForChangesReported();

    assert_true(_event instanceof getWindow(mql).MediaQueryListEvent);
    assert_equals(_event.type, "change");
    assert_false(_event.bubbles);
    assert_false(_event.cancelable);
}, 'constructor of "change" event');
</script>