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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>CSS Grid Layout Test: grid in grid</title>
+    <link rel="author" title="Leo Deng" href="mailto:myst.dg@gmail.com">
+    <link rel="help" href="https://drafts.csswg.org/css-grid/#grid-items">
+    <link rel="match" href="../reference/grid-layout-grid-in-grid-ref.html">
+    <meta name="assert" content="the nested grid should behave the same as reference.">
+    <style>
+      body {
+        margin: 0;
+        padding: 0;
+      }
+      #caseTitle {
+        margin: 10px;
+        height: 40px;
+      }
+      #grid {
+        height: 150px;
+        width: 150px;
+        background: #eee;
+        display: grid;
+        grid-template-columns: 50px 100px;
+        grid-template-rows: 100px 50px;
+      }
+      .a {
+        background: blue;
+        grid-column: 1;
+        grid-row: 1;
+      }
+      .b {
+        background: yellow;
+        grid-column: 2;
+        grid-row: 1;
+        display: grid;
+        grid-template-columns: 50px 50px;
+        grid-template-rows: 50px 50px;
+      }
+      .b1 {
+        background: orange;
+        grid-column: 1;
+        grid-row: 1;
+      }
+      .b2 {
+        background: cyan;
+        grid-column: 2;
+        grid-row: 2;
+      }
+      .c {
+        background: pink;
+        grid-column: 2;
+        grid-row: 2;
+      }
+    </style>
+  </head>
+  <body>
+    <p id="caseTitle">The test passes if it has the same visual effect as reference.</p>
+    <div id="grid">
+      <div class="a"><div style="height:100px;">&nbsp;</div></div>
+      <div class="b">
+        <div class="b1"><div style="height:50px;">&nbsp;</div></div>
+        <div class="b2"><div style="height:50px;">&nbsp;</div></div>
+      </div>
+      <div class="c"><div style="height:50px;">&nbsp;</div></div>
+    </div>
+  </body>
+</html>