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chromium/third_party/blink/web_tests/external/wpt/css/css-transitions/parsing/transition-valid.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Transitions: parsing transition with valid values</title>
<link rel="help" href="https://drafts.csswg.org/css-transitions/#transition-shorthand-property">
<meta name="assert" content="transition supports the full grammar '<single-transition> #'.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
</head>
<body>
<script>
// <single-transition> = [ none | <single-transition-property> ] ||
// <time> || <easing-function> || <time>
test_valid_value("transition", "1s");
test_valid_value("transition", "cubic-bezier(0, -2, 1, 3)");
test_valid_value("transition", "1s -3s");
test_valid_value("transition", "none");
test_valid_value("transition", "top");

test_valid_value("transition", "1s -3s cubic-bezier(0, -2, 1, 3) top", "top 1s cubic-bezier(0, -2, 1, 3) -3s");
test_valid_value("transition", "1s -3s, cubic-bezier(0, -2, 1, 3) top", "1s -3s, top cubic-bezier(0, -2, 1, 3)");

test_valid_value("transition", "all");
test_valid_value("transition", "all 1s", "1s");

test_valid_value("transition", "initial", "initial");

// TODO: Add test with a single negative time.
// TODO: Add test with a single timing-function keyword.
</script>
</body>
</html>