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diff --git a/testing/web-platform/tests/css/css-transitions/parsing/transition-valid.html b/testing/web-platform/tests/css/css-transitions/parsing/transition-valid.html
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+++ b/testing/web-platform/tests/css/css-transitions/parsing/transition-valid.html
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+<!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", ["1s", "all 1s ease 0s"]);
+test_valid_value("transition", "cubic-bezier(0, -2, 1, 3)", ["cubic-bezier(0, -2, 1, 3)", "all 0s cubic-bezier(0, -2, 1, 3) 0s"]);
+test_valid_value("transition", "1s -3s", ["1s -3s", "all 1s ease -3s"]);
+test_valid_value("transition", "none", ["none", "none 0s ease 0s"]);
+test_valid_value("transition", "top", ["top", "top 0s ease 0s"]);
+
+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)", "all 1s ease -3s, top 0s cubic-bezier(0, -2, 1, 3) 0s"]);
+
+// TODO: Add test with a single negative time.
+// TODO: Add test with a single timing-function keyword.
+</script>
+</body>
+</html>