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chromium/third_party/blink/web_tests/external/wpt/css/css-box/parsing/margin-valid.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS basic box model: parsing margin with valid values</title>
<link rel="author" title="Eric Willigers" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-box-3/#propdef-margin">
<meta name="assert" content="margin supports the full grammar '[ <length> | <percentage> | auto]{1,4}'.">
<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("margin", "10px");
test_valid_value("margin", "20%");
test_valid_value("margin", "calc(2em + 3ex)");
test_valid_value("margin", "auto");
test_valid_value("margin", "-10px");
test_valid_value("margin", "-20%");

test_valid_value("margin", "calc(2em + 3ex) auto");
test_valid_value("margin", "auto calc(2em + 3ex) 20%");
test_valid_value("margin", "10px 20% calc(2em + 3ex) auto");

test_valid_value("margin-top", "10px");
test_valid_value("margin-right", "20%");
test_valid_value("margin-bottom", "calc(2em + 3ex)");
test_valid_value("margin-left", "auto");
test_valid_value("margin-top", "-10px");
test_valid_value("margin-right", "-20%");
</script>
</body>
</html>