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chromium/third_party/blink/web_tests/external/wpt/css/css-animations/historical.html 

<!DOCTYPE html>

<title>Historical CSS Animation features must be removed</title>
<link rel="help" href="https://www.w3.org/TR/css-animations-1/#animations">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function isInterfaceNuked(name) {
  test(function() {
    assert_equals(window[name], undefined)
  }, "Historical CSS features must be removed: " + name)
}
var nukedInterfaces = [
  "WebKitAnimationEvent", // Replaced by unprefixed AnimationEvent
];
nukedInterfaces.forEach(isInterfaceNuked);
</script>