<!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>