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

<!doctype html>
<meta charset="utf-8">
<title>Historical features</title>
<link rel=help href="https://drafts.css-houdini.org/css-typed-om/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
test(function() {
  // https://github.com/w3c/css-houdini-drafts/commit/5261c1a323ea062d69cb5a3f1e69734fd176948a
  assert_false("CSSPositionValue" in self);
}, "Support for CSSPositionValue");
</script>