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MediaQueryList-extends-EventTarget-interop.html
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<!DOCTYPE html>
<meta charset="utf-8">
<meta name="flags" content="dom">
<title>CSS Test: CSSOM View MediaQueryList extends EventTarget (interop)</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";
test(() => {
const mql = window.matchMedia("all");
let receivedEvent;
mql.addListener(event => {
receivedEvent = event;
});
const dispatchedEvent = new Event("change");
mql.dispatchEvent(dispatchedEvent);
assert_equals(receivedEvent, dispatchedEvent);
}, "dispatchEvent triggers listener added with addListener");
promise_test(async t => {
const mql = await createMQL(t);
let calls = 0;
const listener = {
handleEvent() {
calls++;
},
};
mql.addListener(listener);
mql.addEventListener("change", listener);
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 1, "triggerMQLEvent");
mql.dispatchEvent(new Event("change"));
assert_equals(calls, 2, "dispatchEvent");
}, "listener added with addListener and addEventListener is called once");
promise_test(async t => {
const mql = await createMQL(t);
let calls = 0;
const listener = () => {
calls++;
};
mql.addListener(listener);
mql.addEventListener("change", listener, true);
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 2, "triggerMQLEvent");
mql.dispatchEvent(new Event("change"));
assert_equals(calls, 4, "dispatchEvent");
}, "listener added with addListener and addEventListener (capture) is called twice");
promise_test(async t => {
const mql = await createMQL(t);
let calls = 0;
const listener = {
handleEvent() {
calls++;
},
};
mql.addListener(listener);
mql.removeEventListener("change", listener);
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 0, "triggerMQLEvent");
mql.dispatchEvent(new Event("change"));
assert_equals(calls, 0, "dispatchEvent");
}, "removeEventListener removes listener added with addListener");
promise_test(async t => {
const mql = await createMQL(t);
let calls = 0;
const listener = () => {
calls++;
};
mql.addListener(listener);
mql.removeEventListener("change", listener, true);
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 1, "triggerMQLEvent");
mql.dispatchEvent(new Event("change"));
assert_equals(calls, 2, "dispatchEvent");
}, "removeEventListener (capture) doesn't remove listener added with addListener");
promise_test(async t => {
const mql = await createMQL(t);
let calls = 0;
const listener = {
handleEvent() {
calls++;
},
};
mql.addEventListener("change", listener);
mql.removeListener(listener);
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 0, "triggerMQLEvent");
mql.dispatchEvent(new Event("change"));
assert_equals(calls, 0, "dispatchEvent");
}, "removeListener removes listener added with addEventListener");
promise_test(async t => {
const mql = await createMQL(t);
let calls = 0;
const listener = () => {
calls++;
};
mql.addEventListener("change", listener, true);
mql.removeListener(listener);
triggerMQLEvent(mql);
await waitForChangesReported();
assert_equals(calls, 1, "triggerMQLEvent");
mql.dispatchEvent(new Event("change"));
assert_equals(calls, 2, "dispatchEvent");
}, "removeListener doesn't remove listener added with addEventListener (capture)");
// See:
// * https://github.com/whatwg/dom/issues/746
// * https://bugzilla.mozilla.org/show_bug.cgi?id=1492446
// * https://bugs.chromium.org/p/chromium/issues/detail?id=949432
promise_test(async t => {
const mql = await createMQL(t);
let calls = [];
mql.addListener(() => {
calls.push("addListener");
});
mql.addEventListener("change", {
handleEvent() {
calls.push("addEventListener");
},
}, true);
triggerMQLEvent(mql);
await waitForChangesReported();
assert_array_equals(calls, ["addEventListener", "addListener"], "triggerMQLEvent");
calls = [];
mql.dispatchEvent(new Event("change"));
assert_array_equals(calls, ["addEventListener", "addListener"], "dispatchEvent");
}, "capturing event listener fires before non-capturing listener at target");
</script>