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diff --git a/testing/web-platform/tests/css/css-break/block-max-height-001-ref.html b/testing/web-platform/tests/css/css-break/block-max-height-001-ref.html
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+++ b/testing/web-platform/tests/css/css-break/block-max-height-001-ref.html
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+<!DOCTYPE html>
+<html>
+<head>
+  <title>Reference: max-height block fragmentation</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;
+    width: 300px;
+}
+.columns {
+  columns: 3;
+  background: grey;
+  margin-bottom: 1em;
+}
+.columns > div { height:160px; background: yellow; }
+.columns > div > div { height:200px; width:50px; border:solid; }
+  </style>
+</head>
+<body>
+<div class="columns">
+  BEFORE
+  <div>
+    <div></div>
+  </div>
+  AFTER
+</div>
+<div class="columns" style="height:100px">
+  BEFORE
+  <div>
+    <div></div>
+  </div>
+  AFTER
+</div>
+<div class="columns" style="height:70px">
+  BEFORE
+  <div>
+    <div></div>
+  </div>
+  AFTER
+</div>
+<div class="columns" style="height:50px">
+  BEFORE
+  <div>
+    <div></div>
+  </div>
+  AFTER
+</div>
+</body>
+</html>