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chromium/third_party/blink/web_tests/external/wpt/css/css-properties-values-api/animation/custom-property-transition-property-all.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/utils.js"></script>
<div id="target"></div>
<script>

transition_test({
  syntax: "<length>",
  from: "100px",
  to: "200px",
  expected: "150px",
  transitionProperty: "all"
}, 'A custom property can yield a CSS Transition with transition-property: all');

</script>