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<!DOCTYPE html>
<meta charset="utf-8">
<meta name="flags" content="dom">
<title>CSS Test: CSSOM View MediaQueryList extends EventTarget</title>
<link rel="help" href="https://www.w3.org/TR/cssom-view-1/#the-mediaquerylist-interface">
<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";
promise_test(async t => {
const mql = await createMQL(t);
let _event;
mql.onchange = event => {
_event = event;
};
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(_event.media, mql.media);
assert_equals(_event.matches, mql.matches);
}, "onchange adds listener");
promise_test(async t => {
const mql = await createMQL(t);
let calls = 0;
mql.onchange = () => {
calls++;
};
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 1);
mql.onchange = null;
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 1);
}, "onchange removes listener");
promise_test(async t => {
const mql = await createMQL(t);
let calls = 0;
mql.addEventListener("change", {
handleEvent() {
calls++;
},
});
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 1);
}, 'listeners for "change" type are called');
promise_test(async t => {
const mql = await createMQL(t);
mql.addEventListener("matches", t.unreached_func("should not be called"));
triggerMQLEvent(mql);
await waitForChangesReported();
}, 'listeners with different type are not called');
promise_test(async t => {
const mql = await createMQL(t);
let calls = 0;
mql.addEventListener("change", {
handleEvent() {
calls++;
},
}, {once: true});
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 1);
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 1);
}, 'addEventListener "once" option is respected');
promise_test(async t => {
const mql = await createMQL(t);
const listener = t.unreached_func("should not be called");
mql.addEventListener("change", listener);
mql.removeEventListener("change", listener);
triggerMQLEvent(mql);
await waitForChangesReported();
}, "removeEventListener removes listener");
test(() => {
const mql = window.matchMedia("all");
let receivedEvent;
mql.addEventListener("custom", event => {
receivedEvent = event;
event.preventDefault();
}, true);
const dispatchedEvent = new CustomEvent("custom", {
cancelable: true,
detail: {},
});
const defaultAction = mql.dispatchEvent(dispatchedEvent);
assert_equals(receivedEvent, dispatchedEvent);
assert_false(defaultAction);
}, "dispatchEvent works as expected");
</script>
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