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chromium/third_party/blink/web_tests/external/wpt/css/css-fonts/parsing/font-feature-settings-valid.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Fonts Module Level 3: parsing font-feature-settings with valid values</title>
<link rel="help" href="https://www.w3.org/TR/css-fonts-3/#font-feature-settings-prop">
<meta name="assert" content="font-feature-settings supports the full grammar 'normal | <feature-tag-value> #'.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
</head>
<body>
<script>
test_valid_value('font-feature-settings', 'normal');

// <feature-tag-value> = <string> [ <integer> | on | off ]?
test_valid_value('font-feature-settings', '"dlig" 1', '"dlig"');
test_valid_value('font-feature-settings', '"smcp" on', '"smcp"');
test_valid_value('font-feature-settings', "'c2sc'", '"c2sc"');
test_valid_value('font-feature-settings', '"liga" off', '"liga" 0');
test_valid_value('font-feature-settings', '"tnum", \'hist\'', '"tnum", "hist"');

test_valid_value('font-feature-settings', '"PKRN"');

test_valid_value('font-feature-settings', '"dlig" 1, "smcp" on, "dlig" 0', '"dlig", "smcp", "dlig" 0');
</script>
</body>
</html>