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

<!DOCTYPE html>
<meta charset="UTF-8">
<title>display interpolation</title>
<link rel="help" href="https://www.w3.org/TR/CSS2/visuren.html#display-prop">
<meta name="assert" content="display supports animation">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>

<body>
<script>
test_not_animatable({
  property: 'display',
  from: 'none',
  to: 'flex',
  underlying: 'block'
});
</script>
</body>