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chromium/third_party/blink/web_tests/external/wpt/html/semantics/embedded-content/the-img-element/current-pixel-density/error.html 

<!doctype html>
<title>img current pixel density error</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id=log></div>
<img id=ref src="404" alt="testing">
<img srcset="404" alt="testing">
<img srcset="404 0.5x" alt="testing">
<img srcset="404 2x" alt="testing">
<img srcset="404 100w" alt="testing">
<img srcset="404 100w" sizes="500px" alt="testing">
<picture><img src="404 100w" sizes="500px" alt="testing"></picture>
<script>
setup({explicit_done:true});
onload = function() {
  var ref = document.getElementById("ref");
  var expected_width = ref.width;
  var expected_height = ref.height;
  [].forEach.call(document.images, function(img) {
    test(function() {
      assert_not_equals(expected_width, 0, 'expected_width');
      assert_not_equals(expected_height, 0, 'expected_height');
      assert_equals(img.width, expected_width, 'width');
      assert_equals(img.height, expected_height, 'height');
      assert_equals(img.naturalWidth, 0, 'naturalWidth');
      assert_equals(img.naturalHeight, 0, 'naturalHeight');
    }, img.outerHTML);
  });
  done();
};
</script>