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diff --git a/testing/web-platform/tests/css/css-grid/subgrid/grid-gap-001-ref.html b/testing/web-platform/tests/css/css-grid/subgrid/grid-gap-001-ref.html
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+++ b/testing/web-platform/tests/css/css-grid/subgrid/grid-gap-001-ref.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>Reference: subgrid with definite grid-gap in both axes</title>
+  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
+  <style>
+html,body {
+  color:black; background-color:white; font:24px/1 monospace; padding:0; margin:0;
+}
+
+  .wrapper {
+    display: inline-grid;
+    gap: 20px 10px;
+    grid-template-columns: repeat(4,auto);
+    grid-template-rows: repeat(3,auto);
+    background-color: #fff;
+    color: #444;
+  }
+
+  .box {
+    background-color: #444;
+    color: #fff;
+    padding: 20px;
+  }
+
+  .box .box {
+    background-color: #ccc;
+    color: #444;
+  }
+
+  .a {
+    grid-area: 1 / 1 / 2 / 3;
+  }
+
+  .b {
+    grid-area: 1/4;
+  }
+
+  .c {
+    grid-column: 1;
+    grid-row: 2 / 4;
+    margin-right: 10px;
+  }
+
+  .d {
+    grid-column: 2 / 5;
+    grid-row: 2 / 4;
+    display: grid;
+    row-gap: 100px;
+    column-gap: 10px;
+    grid: repeat(2,auto) / repeat(3,auto);
+  }
+
+  .e {
+    grid-area: 1/2; visibility:hidden; margin-left:15px;
+  }
+  .f {
+    grid-area: 1/3; visibility:hidden; margin-left:10px;
+  }
+  .g {
+    grid-area: 1/4; visibility:hidden; margin-left:15px;
+  }
+</style>
+</head>
+<body>
+
+<div class="wrapper">
+  <div class="box a">A</div><div class="box e">E</div><div class="box f">F</div><div class="box g">G</div>
+  <div class="box b">B</div>
+  <div class="box c">C</div>
+  <div class="box d">
+    <div class="box">E</div>
+    <div class="box">F</div>
+    <div class="box">G</div>
+    <div class="box h">H</div>
+    <div class="box i">I</div>
+  </div>
+</div>