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diff --git a/testing/web-platform/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-003-ref.html b/testing/web-platform/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-003-ref.html
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+++ b/testing/web-platform/tests/css/css-grid/masonry/tentative/fragmentation/masonry-fragmentation-003-ref.html
@@ -0,0 +1,114 @@
+<!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: Grid axis fragmentation with column masonry layout</title>
+  <link rel="author" title="Mats Palmgren" href="mailto:mats@mozilla.com">
+  <style>
+html,body {
+  color:black; background-color:white; font:10px/1 monospace; padding:0; margin:0;
+}
+wrapper {
+  display: block;
+  width: 600px;
+  height: 600px;
+  overflow: hidden;
+}
+
+.columns {
+  columns: 3;
+  column-fill: auto;
+  background: lightgrey;
+  margin-bottom: 15px;
+}
+
+.grid {
+  display: grid;
+  grid: 20px auto 30px / auto;
+  border: solid;
+  border-width: 3px 1px 7px 5px;
+  padding: 1px 3px 5px 7px;
+  gap: 1px 5px;
+}
+
+x {
+  background: cyan;
+  min-width: 20px;
+  min-height: 10px;
+}
+y {
+  background: blue;
+  width: 35px;
+}
+z {
+  background: gray;
+  width: 40px;
+}
+masonry-track {
+  display: grid;
+  justify-content: start;
+  column-gap: 5px;
+}
+</style>
+</head>
+<body>
+<wrapper style="display:none">
+<div class="columns" style="height:90px">
+  <div class="grid">
+    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
+    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
+    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
+  </div>
+</div>
+<div class="columns" style="height:68px">
+  <div class="grid">
+    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
+    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
+    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
+  </div>
+</div>
+<div class="columns" style="height:48px">
+  <div class="grid">
+    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
+    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
+    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
+  </div>
+</div>
+<div class="columns" style="height:38px">
+  <div class="grid">
+    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
+    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
+    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
+  </div>
+</div>
+<div class="columns" style="height:28px">
+  <div class="grid">
+    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
+    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
+    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
+  </div>
+</div>
+<div class="columns" style="height:18px">
+  <div class="grid">
+    <masonry-track><x></x><y></y><y></y><x></x></masonry-track>
+    <masonry-track><x></x><x></x><x></x><z></z></masonry-track>
+    <masonry-track><z></z><z></z><x></x><z></z></masonry-track>
+  </div>
+</div>
+</wrapper>
+
+<script>
+let wrapper = document.querySelectorAll("wrapper")[0];
+let grids = document.querySelectorAll(".grid");
+for (let e of grids) {
+  for (let track of e.children) {
+    track.style.gridTemplateColumns = "repeat(" + track.children.length + ",auto)";
+  }
+}
+wrapper.style.display="";
+</script>
+</body>
+</html>