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+++ b/testing/web-platform/tests/css/css-break/parsing/widows-invalid.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Fragmentation Module Level 3: parsing widows with invalid values</title>
+<link rel="help" href="https://drafts.csswg.org/css-break/#propdef-widows">
+<meta name="assert" content="widows supports only the grammar '<integer>'.">
+<meta name="assert" content="Negative values and zero are invalid.">
+<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("widows", "auto");
+test_invalid_value("widows", "1 234");
+test_invalid_value("widows", "-234");
+test_invalid_value("widows", "-1");
+test_invalid_value("widows", "0");
+</script>
+</body>
+</html>