chromium/native_client_sdk/src/examples/api/audio/index.html

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  <h2>Status: <code id="statusField">NO-STATUS</code></h2>
  <p>The Sine Wave Synthesizer example demonstrates playing sound (a sine
  wave). Enter the desired frequency and hit play to start, stop to end.</p>

  <p>Click the buttons to start and stop the sine wave playing.</p>
  <button id="playButton">Play</button>
  <button id="stopButton">Stop</button>

  <p>Enter the frequency of the sine wave:</p>
  <input type="text" size="15" id="frequencyField" value="440">

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