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diff --git a/testing/web-platform/tests/css/css-scroll-snap/parsing/scroll-snap-type-invalid.html b/testing/web-platform/tests/css/css-scroll-snap/parsing/scroll-snap-type-invalid.html
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+++ b/testing/web-platform/tests/css/css-scroll-snap/parsing/scroll-snap-type-invalid.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Scroll Snap Test: scroll-snap-type with invalid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-snap-type">
+<meta name="assert" content="scroll-snap-type supports only the grammar 'none | [ x | y | block | inline | both ] [ mandatory | proximity ]?'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_invalid_value("scroll-snap-type", "auto");
+
+test_invalid_value("scroll-snap-type", "x y");
+test_invalid_value("scroll-snap-type", "block mandatory inline");
+
+test_invalid_value("scroll-snap-type", "both none");
+test_invalid_value("scroll-snap-type", "mandatory");
+test_invalid_value("scroll-snap-type", "proximity");
+test_invalid_value("scroll-snap-type", "mandatory inline");
+test_invalid_value("scroll-snap-type", "proximity both");
+test_invalid_value("scroll-snap-type", "mandatory x");
+test_invalid_value("scroll-snap-type", "proximity y");
+test_invalid_value("scroll-snap-type", "mandatory block");
+test_invalid_value("scroll-snap-type", "proximity mandatory");
+</script>
+</body>
+</html>