File: getUserMedia2.html

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webkit2gtk 2.34.6-1~deb10u1
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<!DOCTYPE html>
<html>
    <head>
        <script>
            function startCapture()
            {
                navigator.mediaDevices.getUserMedia({ audio: true, video: true }).then(async (s) => {
                    video.srcObject = s;
                    await video.play();
                    while (video.videoWidth != 640)
                        await new Promise(resolve => setTimeout(resolve, 50));
                    checkIsPlaying();
                });
            }

            function checkIsNotPlaying() {
                window.webkit.messageHandlers.gum.postMessage(video.paused ? "PASS" : "FAIL");
            }

            function checkIsPlaying() {
                window.webkit.messageHandlers.gum.postMessage(video.paused ? "FAIL" : "PASS");
            }
        </script>
    <head>

    <body onload="startCapture()">
        <video id="video" controls playsinline autoplay></video>
    </body>
</html>