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

<!DOCTYPE html>
<title>CSS Positioned Layout Module Test: getComputedStyle().overlay</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/computed-testcommon.js"></script>
<div id="target"></div>
<script>
  test_computed_value("overlay", "none", "none");
  // 'auto' also computes to 'none' due to this UA style while the element is
  // not in the top layer:
  //
  // * { overlay: none !important }
  test_computed_value("overlay", "auto", "none");
  test_computed_value("overlay", "inherit", "none");
  test_computed_value("overlay", "initial", "none");
  test_computed_value("overlay", "revert", "none");
  test_computed_value("overlay", "unset", "none");
</script>