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chromium/third_party/blink/web_tests/external/wpt/html/canvas/element/drawing-images-to-the-canvas/2d.drawImage.canvas.html 

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>Canvas test: 2d.drawImage.canvas</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
<body class="show_output">

<h1>2d.drawImage.canvas</h1>
<p class="desc"></p>


<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<p class="output expectedtext">Expected output:<p><img src="/images/green-100x50.png" class="output expected" id="expected" alt="">
<ul id="d"></ul>
<script>
var t = async_test("");
_addTest(function(canvas, ctx) {

  var canvas2 = document.createElement('canvas');
  canvas2.width = 100;
  canvas2.height = 50;
  var ctx2 = canvas2.getContext('2d');
  ctx2.fillStyle = '#0f0';
  ctx2.fillRect(0, 0, 100, 50);

  ctx.fillStyle = '#f00';
  ctx.drawImage(canvas2, 0, 0);

  _assertPixelApprox(canvas, 0,0, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 99,0, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 0,49, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 99,49, 0,255,0,255, 2);

  ctx.drawImage(document.createElement('canvas'), 0, 0);

  _assertPixelApprox(canvas, 0,0, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 99,0, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 0,49, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 99,49, 0,255,0,255, 2);

});
</script>