1560215.html - mozsearch

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<html class="reftest-wait">

<head>

    <script>

      async function start () {

        const canvas = document.createElement('canvas')

        const context = canvas.getContext('2d')

        context.fillStyle = "red"

        context.fillRect(0, 0, 1, 1)

        const recorder = new MediaRecorder(

          canvas.captureStream(), { videoBitsPerSecond: 16 })

        recorder.start(100)

        await new Promise(r => recorder.onstart = r)

        recorder.pause()

        document.documentElement.removeAttribute("class")

      window.addEventListener('load', start)

    </script>

</head>

</html>