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Test Info:

<title>Do not reset playback rate when removing non-loaded media from a document</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="manifest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<script class="testbody" type="text/javascript">
* When removing media from a document, it should only trigger internal pause,
* instead of the pause method, which would trigger loading process and reset
* the media's playback rate for non-loaded media.
async function startTest() {
info(`create a media and append it to a document`);
const audio = document.createElement("audio");
info(`change audio's playbackRate and remove it from a document`);
const expectedRate = 0.1;
audio.playbackRate = expectedRate;
await once(audio, "ratechange");
is(audio.playbackRate, expectedRate,
`${audio.playbackRate} is equal to ${expectedRate}`);
info(`queue a macrotask to check if the playback rate is still unchanged`);
setTimeout(() => {
// If we unexpectedly reset the playback rate, it would happen in a
// microtask when removing media from a document [1] (Await a stable state),
// which would always be run before the macrotask.
is(audio.playbackRate, expectedRate,
`${audio.playbackRate} is equal to ${expectedRate}`);
}, 0);
onload = startTest;