A simple progress bar with RxJS and D3

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<html>
    <head>
        <script src = "https://cdnjs.cloudflare.com/ajax/libs/d3/4.9.1/d3.min.js"></script>
        <script src = "https://cdnjs.cloudflare.com/ajax/libs/rxjs/5.4.1/Rx.min.js"></script>
    </head>
    <body>
        <div id="time"></div>
        <input type="range"></input>
        <button id = "play">Play</button>
        <button id = "pause">Pause</button>
        <button id = "stop">Stop</button>
        <button id = "speed1x">1x</button>
        <button id = "speed2x">2x</button>
        <script src = "main.js"></script>
    </body>
</html>
    