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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Fonts Module Level 4: parsing font-stretch with invalid values</title>
+<link rel="help" href="https://www.w3.org/TR/css-fonts-4/#font-stretch-prop">
+<meta name="assert" content="font-stretch supports only the grammar 'normal | <percentage> | ultra-condensed | extra-condensed | condensed | semi-condensed | semi-expanded | expanded | extra-expanded | ultra-expanded'.">
+<meta name="assert" content="Values less than 0% 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('font-stretch', 'auto');
+test_invalid_value('font-stretch', 'normal, ultra-condensed');
+test_invalid_value('font-stretch', 'condensed expanded');
+test_invalid_value('font-stretch', '-50%');
+</script>
+</body>
+</html>