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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>CSS Reference: Test for calc() on background-image gradients</title>
+  <link rel="author" title="L. David Baron" href="https://dbaron.org/">
+  <meta name="flags" content="">
+<style type="text/css">
+
+p {
+    height: 50px; width: 200px;
+    border: thin solid;
+}
+
+#one { background-image: radial-gradient(circle farthest-side at 150px 20px, red, green); }
+
+</style>
+</head>
+<body>
+<p id="one"></p>
+</body>
+</html>