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chromium/content/test/data/gpu/functional_webgl_low_power.html 

<html>
<script type="text/javascript" src="./functional_files/context.js"></script>
<body onload="startWebGLContext({powerPreference: 'low-power'})">
  <canvas id="glcanvas" width="640" height="480">
    Your browser doesn't appear to support the HTML5 <code>&lt;canvas&gt;</code> element.
  </canvas>
</body>
</html>