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<!DOCTYPE html>
<video width="200"></video>
<script>
function createSource(src, media) {
var source = document.createElement('source');
source.src = src;
if (media) {
source.media = media;
}
return source;
}
const rAF = () => new Promise(resolve => requestAnimationFrame(resolve));
const hash = str => str.substr(str.lastIndexOf('#'));
(async () => {
const v = document.querySelector('video');
v.getBoundingClientRect(); // force layout flush. ensure viewport dimensions are up-to-date
v.append(createSource('/media-source/mp4/test.mp4#a', '(min-width: 200px)'));
v.append(createSource('/media-source/mp4/test.mp4#b'));
await rAF();
await rAF();
window.resolveBeforeEnvChange(hash(v.currentSrc));
window.frameElement.width = '150';
await rAF();
await rAF();
window.resolveAfterEnvChange(hash(v.currentSrc));
v.load()
await rAF();
await rAF();
window.resolveAfterLoadCalled(hash(v.currentSrc));
})();
</script>
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