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chromium/third_party/blink/web_tests/external/wpt/html/canvas/element/pixel-manipulation/2d.imageData.object.readonly.html 

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>Canvas test: 2d.imageData.object.readonly</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.imageData.object.readonly</h1>
<p class="desc">ImageData objects properties are read-only</p>


<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>

<ul id="d"></ul>
<script>
var t = async_test("ImageData objects properties are read-only");
_addTest(function(canvas, ctx) {

  var imgdata = ctx.getImageData(0, 0, 10, 10);
  var w = imgdata.width;
  var h = imgdata.height;
  var d = imgdata.data;
  imgdata.width = 123;
  imgdata.height = 123;
  imgdata.data = [100,100,100,100];
  _assertSame(imgdata.width, w, "imgdata.width", "w");
  _assertSame(imgdata.height, h, "imgdata.height", "h");
  _assertSame(imgdata.data, d, "imgdata.data", "d");
  _assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0");
  _assertSame(imgdata.data[1], 0, "imgdata.data[\""+(1)+"\"]", "0");
  _assertSame(imgdata.data[2], 0, "imgdata.data[\""+(2)+"\"]", "0");
  _assertSame(imgdata.data[3], 0, "imgdata.data[\""+(3)+"\"]", "0");

});
</script>