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diff --git a/testing/web-platform/tests/css/css-contain/contain-paint-dynamic-003-ref.html b/testing/web-platform/tests/css/css-contain/contain-paint-dynamic-003-ref.html
new file mode 100644
index 0000000000..b30f32d9c3
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+++ b/testing/web-platform/tests/css/css-contain/contain-paint-dynamic-003-ref.html
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+<!DOCTYPE html>
+<html>
+<meta charset="utf-8">
+<title>Dynamic change to paint containment (reference)</title>
+
+<style>
+  #container {
+      width: 100px;
+      height: 100px;
+      background: green;
+      contain: none;
+  }
+  #overflowing {
+      width: 400px;
+      height: 100px;
+  }
+  .square {
+      display: inline-block;
+      width: 50px;
+      height: 50px;
+      margin: 5px;
+  }
+  .green {
+      background: green;
+  }
+</style>
+
+<body>
+  <p>PASS if you see <em>two</em> green squares.</p>
+  <div id="container">
+    <div id="overflowing"><div class="square"></div><div class="square"></div><div class="red square"></div></div>
+  </div>
+</body>
+</html>