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diff --git a/testing/web-platform/tests/css/css-overflow/webkit-line-clamp-018.html b/testing/web-platform/tests/css/css-overflow/webkit-line-clamp-018.html
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+++ b/testing/web-platform/tests/css/css-overflow/webkit-line-clamp-018.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+<meta charset="utf-8">
+<title>CSS Overflow: Dynamically changing -webkit-line-clamp</title>
+<link rel="author" title="Cameron McCormack" href="mailto:cam@mcc.id.au">
+<link rel="help" href="https://drafts.csswg.org/css-overflow-3/#webkit-line-clamp">
+<link rel="match" href="reference/webkit-line-clamp-018-ref.html">
+<meta name="assert" content="Dynamically changing -webkit-line-clamp on an element from a number to none remove the clamping.">
+<style>
+.clamp {
+  display: -webkit-box;
+  -webkit-box-orient: vertical;
+  -webkit-line-clamp: 3;
+  font: 16px / 32px serif;
+  white-space: pre;
+  padding: 0 4px;
+  background-color: yellow;
+  overflow: hidden; /* can be removed once implementations update their old -webkit-line-clamp implementations */
+}
+</style>
+<div class="clamp">Line 1
+Line 2
+Line 3
+Line 4
+Line 5</div>
+<p>Following content.</p>
+<script>
+window.onload = function() {
+  document.querySelector(".clamp").style.webkitLineClamp = "none";
+  document.documentElement.className = "";
+};
+</script>