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diff --git a/testing/web-platform/tests/css/css-flexbox/canvas-dynamic-change-001.html b/testing/web-platform/tests/css/css-flexbox/canvas-dynamic-change-001.html
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+++ b/testing/web-platform/tests/css/css-flexbox/canvas-dynamic-change-001.html
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+<!DOCTYPE html>
+<meta charset="UTF-8">
+<title>Canvas size dynamic change in flexbox layout</title>
+<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-items">
+<meta name="assert" content="This test ensures proper layouting of canvas element as flex-items"/>
+<link href="support/flexbox.css" rel="stylesheet">
+<style>
+.red {
+  width: 600px;
+  height: 400px;
+  background: red;
+}
+canvas {
+  background: green;
+}
+</style>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/check-layout-th.js"></script>
+<div id=log></div>
+
+<div class="red">
+  <div class="flexbox column">
+    <!-- The height=400 attribute makes the aspect ratio be 300x400. 300 from
+         the fallback width of replaced elements. 400 from the attribute.
+	 After stretching to 600px wide, the height should be 800px. -->
+    <canvas id="canvas" data-expected-height="800"></canvas>
+  </div>
+</div>
+
+<script>
+var canvas = document.getElementById('canvas');
+
+requestAnimationFrame(function() {
+  canvas.height = 400;
+  checkLayout('.flexbox');
+});
+
+</script>