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diff --git a/testing/web-platform/tests/css/css-backgrounds/reference/box-shadow-039-ref.html b/testing/web-platform/tests/css/css-backgrounds/reference/box-shadow-039-ref.html
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+<!DOCTYPE html>
+
+  <meta charset="UTF-8">
+
+  <title>CSS Reference Test</title>
+
+  <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+
+  <style>
+  div.blue
+    {
+      background-color: rgba(0, 0, 255, 0.5);  /* semi-transparent blue */
+      border: black double 18px;
+      height: 36px;
+      width: 36px;
+    }
+
+  div#sub-test1-orange
+    {
+      background-color: rgba(255, 165, 0, 0.5);  /* semi-transparent orange */
+      bottom: 72px; /* offsetHeight == 72px */
+      height: 72px;
+      left: 72px; /* offsetWidth == 72px */
+      position: relative;
+      width: 36px;
+    }
+
+  div#sub-test21-orange
+    {
+      background-color: rgba(255, 165, 0, 0.5);  /* semi-transparent orange */
+      bottom: 126px; /* 18px + 72px + 36px == 126px */
+      height: 18px;
+      left: 18px;
+      position: relative;
+      width: 108px;
+    }
+
+  div#sub-test22-orange
+    {
+      background-color: rgba(255, 165, 0, 0.5);  /* semi-transparent orange */
+      bottom: 126px;
+      height: 72px;
+      left: 72px;
+      position: relative;
+      width: 54px;
+    }
+
+  div#sub-test23-orange
+    {
+      background-color: rgba(255, 165, 0, 0.5);  /* semi-transparent orange */
+      bottom: 126px;
+      height: 18px;
+      left: 18px;
+      position: relative;
+      width: 108px;
+    }
+
+  div#sub-test3-orange
+    {
+      background-color: rgba(255, 165, 0, 0.5);  /* semi-transparent orange */
+      bottom: 162px;
+      height: 36px;
+      left: 72px;
+      position: relative;
+      width: 18px;
+    }
+  </style>
+
+  <h3>Not inset and Npx 0px: 36px 0px</h3>
+
+  <div class="blue"></div><div id="sub-test1-orange"></div>
+
+  <div class="blue" style="position: relative; bottom: 36px;"></div><div id="sub-test21-orange"></div><div id="sub-test22-orange"></div><div id="sub-test23-orange"></div>
+
+  <div class="blue" style="position: relative; bottom: 108px;"></div><div id="sub-test3-orange"></div>