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diff --git a/testing/web-platform/tests/css/css-grid/subgrid/subgrid-item-block-size-001.html b/testing/web-platform/tests/css/css-grid/subgrid/subgrid-item-block-size-001.html
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+++ b/testing/web-platform/tests/css/css-grid/subgrid/subgrid-item-block-size-001.html
@@ -0,0 +1,88 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <meta charset="utf-8">
+  <title>CSS Grid Test: subgrid item auto block-size</title>
+  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
+  <link rel="help" href="https://drafts.csswg.org/css-grid-2">
+  <link rel="match" href="subgrid-item-block-size-001-ref.html">
+  <style>
+html,body {
+  color:black; background-color:white; font:16px/1 monospace; padding:0; margin:0;
+}
+
+
+body { width:600px; }
+
+.grid {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  grid-auto-flow:dense;
+  gap: 40px;
+}
+
+.card {
+  background-color: #fff;
+  grid-row: auto / span 3;
+  grid-template-rows: subgrid;
+  grid-template-columns: auto;
+  display: grid;
+}
+
+
+.card .inner, .card footer {
+  padding: 10px;
+}
+
+.card .inner { background: grey; }
+
+.card h2 {
+  margin: 0;
+  color: #fff;
+  background-color: rgb(3,99,143);
+  border-bottom: 4px solid rgb(24,154,153);
+}
+
+.card footer {
+  background-color: rgb(182,222,211);
+}
+
+* { box-sizing: border-box; }
+
+item {
+  border: 1px solid;
+  grid-column: 2;
+}
+
+</style>
+<body>
+
+<div class="grid">
+
+   <div class="card">
+     <h2></h2>
+     <div class="inner">
+       <p>The contents.</p>
+     </div>
+     <footer>Footer contents</footer>
+   </div>
+
+    <item>1</item>
+    <item>2</item>
+    <item>3</item>
+
+    <div class="card">
+     <h2>My title</h2>
+     <div class="inner">
+       <p>The contents. I have a lot of content, more content than the other ones.</p>
+     </div>
+     <footer></footer>
+   </div>
+
+</div>
+
+</body>
+</html>