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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 with stroke-box</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-001-ref.html">
+  <meta name="assert" content="The clip-path property allows specifying
+    basic shapes and reference boxes. This test checks the usage of the correct
+    reference box. 'stroke-box' was specified but is not supported for HTML
+    elements. The used value should be 'border-box' for the polygon() function
+    instead. By mixing percentage and absolute values as coordinates we check
+    the correct used reference box. On sucess you should see a green
+    vertical stripe next to a lime green vertical stripe. Both should be of equal
+    size.">
+<style>
+div {
+  width: 50px;
+  height: 50px;
+  background-color: green;
+  padding: 25px;
+  margin: 25px;
+  border: red solid 50px;
+  border-left: lime solid 50px;
+}
+</style>
+<body>
+  <p>The test passes if you see a green vertical stripe next to a lime green vertical stripe, both stripes should be of equal size and there should be no red.</p>
+  <div style="clip-path: polygon(0% 25%, 50% 50px, 100px 75%, 0 150px) stroke-box"></div>
+</body>
+</html>
+\ No newline at end of file