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diff --git a/testing/web-platform/tests/css/css-masking/parsing/mask-invalid.html b/testing/web-platform/tests/css/css-masking/parsing/mask-invalid.html
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+++ b/testing/web-platform/tests/css/css-masking/parsing/mask-invalid.html
@@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Masking Module Level 1: parsing mask with invalid values</title>
+<link rel="help" href="https://www.w3.org/TR/css-masking-1/#the-mask">
+<meta name="assert" content="mask supports only the '<mask-layer>#' grammar.">
+<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('mask', 'none linear-gradient(to 0% 0%, rgb(0, 0, 0), rgb(0, 0, 255))');
+test_invalid_value('mask', 'none alpha luminance');
+test_invalid_value('mask', 'linear-gradient(to 0% 0%, rgb(0, 0, 0), rgb(0, 0, 255)) url("https://example.com/")');
+
+test_invalid_value('mask', '1px 2px 3px');
+test_invalid_value('mask', '1px 2px 3px 4px');
+test_invalid_value('mask', '1px 2px / contain / cover');
+
+test_invalid_value('mask', 'repeat-y repeat-x');
+
+test_invalid_value('mask', 'stroke-box no-clip view-box');
+
+test_invalid_value('mask', 'border-box view-box padding-box');
+
+test_invalid_value('mask', 'no-clip border-box content-box');
+
+test_invalid_value('mask', 'content-box stroke-box no-clip');
+
+test_invalid_value('mask', 'add intersect');
+</script>
+</body>
+</html>