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chromium/third_party/blink/web_tests/fast/css/getComputedStyle-relativeURL.html 

<!DOCTYPE html>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<div id="target"></div>

<script>
  target.style.backgroundImage = "-webkit-cross-fade(url(images1.jpg), url(images2.jpg), 0.5)";
  test(function() {
    var expected = '-webkit-cross-fade(url("' + location.href.replace('getComputedStyle-relativeURL.html', 'images1.jpg') + '"), url("' + location.href.replace('getComputedStyle-relativeURL.html', 'images2.jpg') + '"), 0.5)';
    assert_equals(getComputedStyle(target).backgroundImage, expected);
    assert_equals(target.style.backgroundImage, '-webkit-cross-fade(url("images1.jpg"), url("images2.jpg"), 0.5)');
  }, 'Testing that getComputedStyle.backgroundImage returns absolute URLs and style.backgroundImage returns relative URLs');
</script>