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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/parsing/background-size-valid.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Backgrounds and Borders Module Level 3: parsing background-size with valid values</title>
<link rel="author" title="Eric Willigers" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds/#background-size">
<meta name="assert" content="background-size supports the full grammar '<bg-size>#'.">
<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("background-size", "1px", ["1px", "1px auto"]);
test_valid_value("background-size", "1px auto", ["1px", "1px auto"]);
test_valid_value("background-size", "2% 3%");
test_valid_value("background-size", "auto", ["auto", "auto auto"]);
test_valid_value("background-size", "auto auto", ["auto", "auto auto"]);
test_valid_value("background-size", "auto 4%");
test_valid_value("background-size", "contain");
test_valid_value("background-size", "cover");

test_valid_value("background-size", "auto 1px, 2% 3%, contain");
</script>
</body>
</html>