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diff --git a/testing/web-platform/tests/css/css-scroll-snap/parsing/scroll-margin-valid.html b/testing/web-platform/tests/css/css-scroll-snap/parsing/scroll-margin-valid.html
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+++ b/testing/web-platform/tests/css/css-scroll-snap/parsing/scroll-margin-valid.html
@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Scroll Snap Test: scroll-margin with valid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-margin">
+<meta name="assert" content="scroll-margin supports the full grammar '<length>{1,4}'.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+</head>
+<body>
+<script>
+test_valid_value("scroll-margin-top", "0", "0px");
+test_valid_value("scroll-margin-top", "-10px");
+test_valid_value("scroll-margin-top", "calc(2em + 3ex)");
+
+
+test_valid_value("scroll-margin-right", "0", "0px");
+test_valid_value("scroll-margin-right", "-10px");
+test_valid_value("scroll-margin-right", "calc(2em + 3ex)");
+
+
+test_valid_value("scroll-margin-bottom", "0", "0px");
+test_valid_value("scroll-margin-bottom", "-10px");
+test_valid_value("scroll-margin-bottom", "calc(2em + 3ex)");
+
+
+test_valid_value("scroll-margin-left", "0", "0px");
+test_valid_value("scroll-margin-left", "-10px");
+test_valid_value("scroll-margin-left", "calc(2em + 3ex)");
+
+
+test_valid_value("scroll-margin", "0", "0px");
+test_valid_value("scroll-margin", "-10px");
+test_valid_value("scroll-margin", "calc(2em + 3ex)");
+
+test_valid_value("scroll-margin", "1px 2px");
+test_valid_value("scroll-margin", "1px 2px 3px");
+test_valid_value("scroll-margin", "1px 2px 3px 4px");
+test_valid_value("scroll-margin", "0 0 0 0", "0px");
+</script>
+</body>
+</html>