media-element-demo.html

<html>
    <head>
        <title>WebM muxer media element demo</title>
        <script type="module" src="media-element-demo.js"></script>
        <script src="EBML.js"></script>
    </head>
    <body>
        <input type="button" id="start" value="Start" disabled>
        <input type="button" id="save" value="Save" disabled>
        <span id="msg"></span>
        <video id="video" style="max-width: 100%; max-height: 50%; display: none" controls src="https://upload.wikimedia.org/wikipedia/commons/4/41/Big_Buck_Bunny_medium.ogv" poster="https://upload.wikimedia.org/wikipedia/commons/thumb/4/41/Big_Buck_Bunny_medium.ogv/800px--Big_Buck_Bunny_medium.ogv.jpg" muted loop crossOrigin="anonymous"></video>
        <audio id="audio" style="display: none" src="https://upload.wikimedia.org/wikipedia/commons/8/87/120BPMclicktrack.ogg" controls loop crossOrigin="anonymous"></audio>
    </body
</html>