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<!DOCTYPE html>
<html>
  <head>
    <script type="text/javascript"><!--
window.onload = function () {
  var canvas = document.getElementById('testCanvas'),
      context = canvas.getContext('2d');

  // draw a path
  context.beginPath();
  context.moveTo(10, 10);
  context.lineTo(200, 10);
  context.lineTo(200, 200);
  context.stroke();
  context.closePath();

  context.clearRect(0, 0, canvas.width, canvas.height);

  // draw some text
  context.font = 'bold 40px sans-serif';
  context.strokeText("Hello world!", 10, 50);
};
      // --></script>
  </head>
  <body>
    <p>You should see only see "Hello world!" below, without any additional 
    line. JavaScript is required.</p>

    <p><canvas id="testCanvas" width="400" height="300">You need Canvas 
    support.</canvas></p>

  </body>
</html>