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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Masking: mask-origin: mask positioning area</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-origin">
+    <link rel="match" href="mask-origin-2-ref.html">
+    <meta name="assert" content="Test checks whether setting mask origin to margin-box works correctly or not.">
+    <style type="text/css">
+      div.outer {
+        border: 1px solid black;
+        width: 125px;
+        height: 125px;
+      }
+
+      div.inner {
+        /*
+         * content box: 60 x 60
+         * padding box: 72 x 78
+         * border  box: 80 x 90
+         * margin  box: 86 x 94
+         */
+        margin: 1px 2px 3px 4px;
+        border: solid red;
+        border-width: 8px 2px 4px 6px;
+        padding: 6px 9px 12px 3px;
+        width: 60px;
+        height: 60px;
+        position: relative;
+        background-color: blue;
+        mask-image: url(support/50x50-opaque-blue.svg);
+        mask-repeat: no-repeat;
+        mask-origin: margin-box;
+      }
+
+      div.overflow {
+        position: absolute;
+        left: -10px;
+        top: -9px;
+        border: solid transparent;
+        border-width: 15px 13px 19px 13px;
+        width: 60px;
+        height: 60px;
+        background-color: purple;
+      }
+
+      #pos-left-auto { mask-position: left; }
+      #pos-left-bottom { mask-position: left bottom; }
+      #pos-right-top { mask-position: right top; }
+      #pos-right-bottom { mask-position: right bottom; }
+    </style>
+  </head>
+  <body>
+    <div class="outer">
+      <div class="inner" id="pos-left-auto">
+        <div class="overflow"></div>
+      </div>
+    </div>
+    <div class="outer">
+      <div class="inner" id="pos-left-bottom">
+        <div class="overflow"></div>
+      </div>
+    </div>
+    <div class="outer">
+      <div class="inner" id="pos-right-top">
+        <div class="overflow"></div>
+      </div>
+    </div>
+    <div class="outer">
+      <div class="inner" id="pos-right-bottom">
+        <div class="overflow"></div>
+      </div>
+    </div>
+  </body>
+</html>