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diff --git a/testing/web-platform/tests/css/css-masking/mask-image/mask-clip-1.html b/testing/web-platform/tests/css/css-masking/mask-image/mask-clip-1.html
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+++ b/testing/web-platform/tests/css/css-masking/mask-image/mask-clip-1.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>CSS Masking: mask-clip: clip mask image</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="http://www.w3.org/TR/css-masking-1/#the-mask-clip">
+    <link rel="match" href="mask-clip-1-ref.html">
+    <meta name="assert" content="border-box, padding-box, content-box and no-clip values of mask-clip should clip to the appropriate boxes.">
+    <style type="text/css">
+      div.outer {
+        /*
+         * content box: 40 x 20
+         * padding box: 52 x 38
+         * border  box: 60 x 50
+         * margin  box: 66 x 54
+         */
+        background-color: purple;
+        position: absolute;
+        top: 10px;
+        margin: 1px 2px 3px 4px;
+        border: solid transparent;
+        border-width: 8px 2px 4px 6px;
+        padding: 6px 9px 12px 3px;
+        width: 40px;
+        height: 20px;
+      }
+
+      div.mask {
+        mask-size: 100% 100%;
+        mask-origin: border-box;
+        mask-image: url(support/transparent-100x50-blue-100x50.svg);
+      }
+
+      div.border {
+        left: 10px;
+        mask-clip: border-box;
+      }
+
+      div.padding {
+        left: 110px;
+        mask-clip: padding-box;
+      }
+
+      div.content {
+        left: 210px;
+        mask-clip: content-box;
+      }
+
+      div.no-clip {
+        background-color: yellow;
+        left: 310px;
+        mask-clip: no-clip;
+      }
+
+      div.no-clip-inner {
+        background-color: purple;
+        position: absolute;
+        /* allign with border area of the parent*/
+        top: -8px;
+        left: -6px;
+        width: 100px;
+        height: 50px;
+      }
+
+    </style>
+  </head>
+  <body>
+    <div class="outer mask border"></div>
+    <div class="outer mask padding"></div>
+    <div class="outer mask content"></div>
+    <div class="outer mask no-clip">
+      <div class="no-clip-inner"></div>
+    </div>
+  </body>
+</html>