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diff --git a/layout/reftests/css-grid/grid-max-sizing-flex-005-ref.html b/layout/reftests/css-grid/grid-max-sizing-flex-005-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>CSS Grid Test: Testing track flex max-sizing</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1151212">
+  <link rel="help" href="http://dev.w3.org/csswg/css-grid/#algo-flex-tracks">
+  <link rel="match" href="grid-max-sizing-flex-005-ref.html">
+  <style type="text/css">
+body,html { color:black; background:white; font-size:8px; line-height:10px; padding:0; margin:0; }
+
+.grid {
+  display: grid;
+  grid-auto-rows: 12px;
+  border: 3px dashed blue;
+  width: 720px;
+}
+
+.c1 { grid-column: 1 / span 2; }
+.r1 { grid-column: 2 / span 3; }
+.c3 { grid-column: 3 / span 1; }
+
+span {
+  min-height:8px;
+  background: gray;
+  padding: 1px 3px;
+  margin: 1px 5px;
+  justify-self: flex-start;
+}
+
+  </style>
+</head>
+<body>
+
+<div class="grid" style="grid-template-columns: 80px 160px 240px 160px 80px;">
+<span class="c1"></span>
+<span class="r1"></span>
+<span class="c3"></span>
+</div>
+
+<div class="grid" style="grid-template-columns: 72px 144px 216px 144px 72px;">
+<span class="c1"></span>
+<span class="r1"></span>
+<span class="c3"></span>
+</div>
+
+<div class="grid" style="grid-template-columns: 400px 80px 120px 80px 40px;">
+<span class="c1"></span>
+<span class="r1"></span>
+<span class="c3"></span>
+</div>
+
+<div class="grid" style="grid-template-columns: 400px 80px 120px 80px 40px;">
+<span class="c1"></span>
+<span class="c1"></span>
+<span class="c1"></span>
+<span class="r1"></span>
+<span class="c3"></span>
+</div>
+
+<div class="grid" style="grid-template-columns: 400px 320px 0 0 0;">
+<span class="c1"></span>
+<span class="r1"></span>
+<span class="c3"></span>
+</div>
+
+<div class="grid" style="grid-template-columns: 0 400px 0 0 322px;">
+<span class="c1"></span>
+<span class="r1"></span>
+<span class="c3"></span>
+</div>
+
+<div class="grid" style="grid-template-columns: 0 0 0 0 722px;">
+<span class="c1"></span>
+<span class="r1"></span>
+<span class="c3"></span>
+</div>
+
+<!-- test some extreme flex values: -->
+
+<div class="grid" style="grid-template-columns: minmax(10px,0fr);">
+<span class="c1"></span>
+</div>
+
+<div class="grid" style="grid-template-columns: minmax(10px,1fr);">
+<span class="c1"></span>
+</div>
+
+<div class="grid" style="grid-template-columns: minmax(10px,0.000000000000000000000000001fr);">
+<span class="c1"></span>
+</div>
+
+<div class="grid" style="width:794px; grid-template-columns: minmax(10px,0fr);">
+<span class="c1"></span>
+</div>
+
+<div class="grid" style="width:794px; grid-template-columns: minmax(10px,1fr);">
+<span class="c1"></span>
+</div>
+
+<div class="grid" style="width:794px; grid-template-columns: minmax(10px,0.000000000000000000000000001fr);">
+<span class="c1"></span>
+</div>
+
+</body>
+</html>