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chromium/third_party/blink/web_tests/external/wpt/css/css-masking/parsing/mask-position-invalid.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Masking Module Level 1: parsing mask-position with invalid values</title>
<link rel="help" href="https://www.w3.org/TR/css-masking-1/#the-mask-position">
<meta name="assert" content="mask-position supports only the '<position>#' 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-position", "auto");
test_invalid_value("mask-position", "1px 2px 3px");
test_invalid_value("mask-position", "left right");
test_invalid_value("mask-position", "bottom 10%");
test_invalid_value("mask-position", "bottom 10% top 20%");

test_invalid_value("mask-position", "center left 1px");
test_invalid_value("mask-position", "center top 2px");
test_invalid_value("mask-position", "right 3% center");
test_invalid_value("mask-position", "left 4px top");
test_invalid_value("mask-position", "right top 5px");
test_invalid_value("mask-position", "bottom 6% center");
test_invalid_value("mask-position", "bottom 7% left");
test_invalid_value("mask-position", "bottom right 8%");
</script>
</body>
</html>