webm-alpha-capture.html

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<!DOCTYPE HTML>

<html class="reftest-wait">

<meta charset="utf-8">

<title>Test that if a WebM video has an alpha channel, it is displayed correctly when captured.</title>

<script>

async function runTest() {

  const v = document.createElement("video");

  document.body.appendChild(v);

  const vout = document.createElement("video");

  document.body.appendChild(vout);

  v.preload = "auto";

  v.src = "webm-alpha.webm";

  await new Promise(r => v.onloadeddata = r);

  vout.srcObject = v.mozCaptureStream();

  v.play();

  await new Promise(r => vout.onloadeddata = r);

  document.documentElement.removeAttribute("class");

</script>

<body style="background:grey;" onload="runTest()">

</body>

</html>