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+<!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>