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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Masking: mask-position: mask positioning</title>
+    <link rel="author" title="Astley Chen" href="mailto:aschen@mozilla.com">
+    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
+    <link rel="help" href="https://www.w3.org/TR/css-masking-1/#the-mask-position">
+    <link rel="match" href="mask-position-4-ref.html">
+    <meta name="assert" content="Test checks whether positioning mask layer works correctly or not.">
+    <style type="text/css">
+      div {
+        width: 100px;
+        height: 100px;
+      }
+
+      #outer {
+        border: 1px solid black;
+      }
+
+      #inner {
+        background-color: purple;
+        mask: url(support/50x50-opaque-blue.svg) left no-repeat;
+      }
+    </style>
+  </head>
+  <body>
+    <div id="outer">
+      <div id="inner"></div>
+    </div>
+  </body>
+</html>