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diff --git a/testing/web-platform/tests/css/css-align/parsing/grid-gap-shorthand.html b/testing/web-platform/tests/css/css-align/parsing/grid-gap-shorthand.html
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+++ b/testing/web-platform/tests/css/css-align/parsing/grid-gap-shorthand.html
@@ -0,0 +1,36 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Box Alignment Level 3: grid-gap sets longhands</title>
+<link rel="help" href="https://drafts.csswg.org/css-align/#grid-gap-legacy">
+<link rel="author" title="Takuya Kurimoto" href="mailto:takuya004869@gmail.com">
+<meta name="assert" content="grid-gap supports the full grammar '<grid-row-gap> <column-gap>?'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/shorthand-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_shorthand_value('gap', 'normal', {
+  'row-gap': 'normal',
+  'column-gap': 'normal'
+});
+
+test_shorthand_value('gap', '10px 20%', {
+  'row-gap': '10px',
+  'column-gap': '20%'
+});
+
+test_shorthand_value('gap', '10px normal', {
+  'row-gap': '10px',
+  'column-gap': 'normal'
+});
+
+test_shorthand_value('gap', 'normal calc(20% + 10px)', {
+  'grid-row-gap': 'normal',
+  'grid-column-gap': 'calc(20% + 10px)'
+});
+</script>
+</body>
+</html>