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diff --git a/layout/reftests/svg/svg-integration/clip-path/clip-path-polygon-013.html b/layout/reftests/svg/svg-integration/clip-path/clip-path-polygon-013.html
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+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<!DOCTYPE html>
+<html>
+<head>
+  <title>CSS Masking: Test clip-path and polygon different units</title>
+  <link rel="author" title="Dirk Schulze" href="mailto:dschulze@adobe.com">
+  <link rel="help" href="http://www.w3.org/TR/css-masking-1/#clipping-paths">
+  <link rel="help" href="http://www.w3.org/TR/css-masking-1/#propdef-clip-path">
+  <link rel="match" href="clip-path-stripes-003-ref.html">
+  <meta name="assert" content="Test the support of different units for
+    polygon coordinates. The test passes if you see a multiple green and blue
+    stripe pairs. For each pair, the blue and green stripe must be of same
+    length.">
+<style>
+div {
+  width: 100%;
+  height: 20px;
+  background-color: green;
+  padding: 0;
+  margin: 0;
+}
+div:nth-child(odd) {
+  margin-bottom: 5px;
+  background-color: blue;
+}
+</style>
+<body>
+  <p>The test passes if you see a multiple green and blue stripe pairs. For each pair, the blue and green stripe must be of same length.</p>
+  <div style="clip-path: polygon(0 0, 50% 0, 50% 20px, 0 20px)"></div>
+  <div style="width: 50%"></div>
+
+  <div style="clip-path: polygon(0 0, 20em 0, 20em 20px, 0 20px)"></div>
+  <div style="width: 20em"></div>
+
+  <!-- Activate when SVG2 is supported.
+  <div style="clip-path: polygon(0 0, 50vw 0, 50vw 20px, 0 20px)"></div>
+  <div style="width: 50vw"></div>
+
+  <div style="clip-path: polygon(0 0, 40vh 0, 40vh 20px, 0 20px)"></div>
+  <div style="width: 40vh"></div>
+
+  <div style="clip-path: polygon(0 0, calc(30% + 15px) 0, calc(30% + 15px) 20px, 0 20px)"></div>
+  <div style="width: calc(30% + 15px)"></div>-->
+
+  <div style="clip-path: polygon(0 0, 30ex 0, 30ex 20px, 0 20px)"></div>
+  <div style="width: 30ex"></div>
+</body>
+</html>
+\ No newline at end of file