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chromium/third_party/blink/web_tests/external/wpt/css/css-scroll-snap/parsing/scroll-snap-type-valid.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Scroll Snap Test: scroll-snap-type with valid values</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#propdef-scroll-snap-type">
<meta name="assert" content="scroll-snap-type supports the full grammar 'none | [ x | y | block | inline | both ] [ mandatory | proximity ]?'.">
<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("scroll-snap-type", "none");

test_valid_value("scroll-snap-type", "x");
test_valid_value("scroll-snap-type", "y");
test_valid_value("scroll-snap-type", "block");
test_valid_value("scroll-snap-type", "inline");
test_valid_value("scroll-snap-type", "both");

test_valid_value("scroll-snap-type", "y mandatory");
test_valid_value("scroll-snap-type", "block mandatory");
test_valid_value("scroll-snap-type", "both mandatory");
test_valid_value("scroll-snap-type", "inline proximity", "inline"); // The shortest serialization is preferable
test_valid_value("scroll-snap-type", "x proximity", "x");
</script>
</body>
</html>