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chromium/third_party/blink/web_tests/external/wpt/html/canvas/offscreen/pixel-manipulation/2d.imageData.get.unaffected.html 

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.imageData.get.unaffected</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>

<h1>2d.imageData.get.unaffected</h1>
<p class="desc">getImageData() is not affected by context state</p>


<script>
var t = async_test("getImageData() is not affected by context state");
var t_pass = t.done.bind(t);
var t_fail = t.step_func(function(reason) {
    throw reason;
});
t.step(function() {

  var canvas = new OffscreenCanvas(100, 50);
  var ctx = canvas.getContext('2d');

  ctx.fillStyle = '#0f0';
  ctx.fillRect(0, 0, 50, 50)
  ctx.fillStyle = '#f00';
  ctx.fillRect(50, 0, 50, 50)
  ctx.save();
  ctx.translate(50, 0);
  ctx.globalAlpha = 0.1;
  ctx.globalCompositeOperation = 'destination-atop';
  ctx.shadowColor = '#f00';
  ctx.rect(0, 0, 5, 5);
  ctx.clip();
  var imgdata = ctx.getImageData(0, 0, 50, 50);
  ctx.restore();
  ctx.putImageData(imgdata, 50, 0);
  _assertPixelApprox(canvas, 25,25, 0,255,0,255, 2);
  _assertPixelApprox(canvas, 75,25, 0,255,0,255, 2);
  t.done();

});
</script>