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+++ b/testing/web-platform/tests/css/css-anchor-position/inset-area-computed-insets.html
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+<!DOCTYPE html>
+<title>CSS Anchor Positioning: inset-area should not affect computed inset values</title>
+<link rel="help" href="https://drafts.csswg.org/css-anchor-position/#inset-area">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/css-typed-om/resources/testhelper.js"></script>
+<style>
+ #abs {
+ position: absolute;
+ inset-area: span-all;
+ }
+</style>
+<div id="abs"></div>
+<script>
+ test(() => {
+ let style = abs.computedStyleMap();
+ assert_equals(style.get("inset-area").toString(), "span-all", "inset-area is supported");
+ assert_style_value_equals(style.get("left"), new CSSKeywordValue("auto"));
+ assert_style_value_equals(style.get("right"), new CSSKeywordValue("auto"));
+ assert_style_value_equals(style.get("top"), new CSSKeywordValue("auto"));
+ assert_style_value_equals(style.get("bottom"), new CSSKeywordValue("auto"));
+ }, "inset-area does not affect insets at computed value time");
+</script>