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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>Compositing and Blending Level 1: parsing isolation with invalid values</title>
+<link rel="author" title="Eric Willigers" href="mailto:ericwilligers@chromium.org">
+<link rel="help" href="https://drafts.fxtf.org/compositing-1/#propdef-isolation">
+<meta name="assert" content="isolation supports only the grammar '<isolation-mode>'.">
+<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("isolation", "none");
+test_invalid_value("isolation", "auto isolate");
+</script>
+</body>
+</html>