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+++ b/testing/web-platform/tests/css/css-transitions/parsing/transition-computed.html
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+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>CSS Transitions: getComputedStyle().transition</title>
+<link rel="help" href="https://drafts.csswg.org/css-transitions/#transition-shorthand-property">
+<meta name="assert" content="transition computed value is as specified.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/computed-testcommon.js"></script>
+</head>
+<body>
+<div id="target"></div>
+<script>
+// <single-transition> = [ none | <single-transition-property> ] ||
+// <time> || <easing-function> || <time>
+
+test(() => {
+  assert_equals(getComputedStyle(document.getElementById('target')).transition, "all 0s ease 0s");
+}, "Default transition value");
+
+test_computed_value("transition", "1s", "all 1s ease 0s");
+test_computed_value("transition", "cubic-bezier(0, -2, 1, 3)", "all 0s cubic-bezier(0, -2, 1, 3) 0s");
+test_computed_value("transition", "1s -3s", "all 1s ease -3s");
+test_computed_value("transition", "none", "none 0s ease 0s");
+test_computed_value("transition", "top", "top 0s ease 0s");
+
+test_computed_value("transition", "1s -3s cubic-bezier(0, -2, 1, 3) top", "top 1s cubic-bezier(0, -2, 1, 3) -3s");
+test_computed_value("transition", "1s -3s, cubic-bezier(0, -2, 1, 3) top", "all 1s ease -3s, top 0s cubic-bezier(0, -2, 1, 3) 0s");
+
+// TODO: Add test with a single timing-function keyword.
+</script>
+</body>
+</html>