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diff --git a/testing/web-platform/tests/css/css-grid/subgrid/item-percentage-height-001.html b/testing/web-platform/tests/css/css-grid/subgrid/item-percentage-height-001.html
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+++ b/testing/web-platform/tests/css/css-grid/subgrid/item-percentage-height-001.html
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+<!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 percentage height</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="item-percentage-height-001-ref.html">
+  <style type="text/css">
+
+.grid {
+  display: grid;
+  grid: auto auto / auto;
+  grid-row-gap: 60px;
+  border: 1px solid;
+  padding: 2px;
+  padding-top: 5px;
+  height: 300px;
+}
+
+.subgrid {
+  display: grid;
+  grid: subgrid / auto;
+  grid-row: span 2;
+  grid-row-gap: 40px;
+  background: lightgrey;
+  padding: 10px;
+  padding-top: 5px;
+}
+
+.item {
+  align-self: start;
+  height: 100%;
+  width: 100px;
+  background: grey;
+}
+
+  </style>
+</head>
+<body>
+
+<div class="grid">
+  <div class="subgrid">
+    <div class="item"></div>
+    <div class="item" style="height:100px"></div>
+  </div>
+</div>
+
+</body>
+</html>