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diff --git a/testing/web-platform/tests/css/css-easing/step-timing-functions-syntax.html b/testing/web-platform/tests/css/css-easing/step-timing-functions-syntax.html
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+++ b/testing/web-platform/tests/css/css-easing/step-timing-functions-syntax.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<meta name="assert"
+content="This test checks the syntax output of step timing functions" />
+<title>Step timing function syntax tests</title>
+<link rel="help"
+      href="https://drafts.csswg.org/css-easing-1/#step-timing-functions">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="testcommon.js"></script>
+<script src="/css/support/parsing-testcommon.js"></script>
+<body>
+<div id="log"></div>
+<script>
+"use strict";
+
+test_valid_value("animation-timing-function", "step-start", "steps(1, start)");
+test_valid_value("animation-timing-function", "step-end", "steps(1)");
+test_valid_value("animation-timing-function", "steps(1, start)");
+test_valid_value("animation-timing-function", "steps(1, end)", "steps(1)");
+test_valid_value("animation-timing-function", "steps(1, jump-start)");
+test_valid_value("animation-timing-function", "steps(1, jump-end)", "steps(1)");
+test_valid_value("animation-timing-function", "steps(1, jump-both)");
+test_valid_value("animation-timing-function", "steps(2, jump-none)");
+
+test_invalid_value("animation-timing-function", "steps(0, start)");
+test_invalid_value("animation-timing-function", "steps(0, end)");
+test_invalid_value("animation-timing-function", "steps(0, jump-start)");
+test_invalid_value("animation-timing-function", "steps(0, jump-end)");
+test_invalid_value("animation-timing-function", "steps(0, jump-both)");
+test_invalid_value("animation-timing-function", "steps(1, jump-none)");
+
+</script>
+</body>