chromium/chrome/test/data/extensions/api_test/canvas_2d/background.html

<!--
Copyright 2012 The Chromium Authors
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->
<html>
  <head>
    <title>Background page using 2d canvas</title>
  </head>
  <body>
    <div>Below should be a canvas rendered with canvas2D</div>
    <canvas id="my-canvas" width="100" height="100"></canvas>
    <script src="background.js"></script>
  </body>
</html>