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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> \ No newline at end of file