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chromium/third_party/blink/web_tests/external/wpt/css/css-multicol/parsing/columns-invalid.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Multi-column Layout: parsing columns with invalid values</title>
<link rel="help" href="https://drafts.csswg.org/css-multicol/#propdef-columns">
<meta name="assert" content="columns supports only the grammar '<column-width> || <column-count>'.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
</head>
<body>
<script>
// Invalid keyword.
test_invalid_value("columns", "none");

// Only column-count can be unitless.
test_invalid_value("columns", "10px 20px");
test_invalid_value("columns", "10 20");

// column-count needs to be 1 or more.
test_invalid_value("columns", "0 0");
test_invalid_value("columns", "0 7px");

// Excess keywords.
test_invalid_value("columns", "auto auto auto");
test_invalid_value("columns", "10em auto auto");
test_invalid_value("columns", "initial initial");
test_invalid_value("columns", "inherit inherit");
</script>
</body>
</html>