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chromium/third_party/blink/web_tests/external/wpt/css/css-position/overlay/overlay-valid.html 

<!DOCTYPE html>
<title>CSS Positioned Layout Module Test: parsing overlay with valid values</title>
<link rel="help" href="https://drafts.csswg.org/css-position-4/#overlay">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
  // overlay: none | auto
  test_valid_value("overlay", "none");
  test_valid_value("overlay", "auto");
  test_valid_value("overlay", "inherit");
  test_valid_value("overlay", "initial");
  test_valid_value("overlay", "revert");
  test_valid_value("overlay", "unset");
</script>