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diff --git a/layout/reftests/css-grid/grid-relpos-items-001-ref.html b/layout/reftests/css-grid/grid-relpos-items-001-ref.html
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+++ b/layout/reftests/css-grid/grid-relpos-items-001-ref.html
@@ -0,0 +1,61 @@
+<!DOCTYPE HTML>
+<!--
+     Any copyright is dedicated to the Public Domain.
+     http://creativecommons.org/publicdomain/zero/1.0/
+-->
+<html><head>
+  <title>CSS Test: Testing layout of rel.pos. grid items</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1151316">
+  <meta charset="utf-8">
+  <style type="text/css">
+body,html { color:black; background:white; font-size:16px; padding:0; margin:0; }
+
+.grid {
+ height: 30px;
+ border: 3px solid;
+}
+
+.c1 { background: grey; }
+.r2 { transform: translate(-201px, -90px); }
+.r3 { transform: translate(-10px, -40px); }
+.r4 { transform: translate(70px, 40px); }
+
+span {
+  border: 1px solid;
+  display: inline-block;
+  width: 18px;
+  height: 28px;
+  vertical-align: top;
+}
+.abs {
+  background: lime;
+  position: absolute;
+  top: 116px;
+  left: 204px;
+  padding-left: 3px;
+  padding-top: 5px;
+  width: 18px;
+  height: 28px;
+  vertical-align: top;
+}
+.abs1 {
+  position: absolute;
+  top: -5px;
+  left: -11px;
+  width: 30px;
+  height: 36px;
+}
+  </style>
+</head>
+<body>
+
+<div class="grid">
+<span class="c1">1</span>
+<span class="abs r1"><iframe width="20" height="20" src="data:text/html,<body>F"></iframe></span>
+<span class="abs r2"><iframe width="20" height="20" src="data:text/html,<body>2"></iframe></span>
+<span class="abs r3" style="xheight:23px"><span class="abs1">r3</span></span>
+<span class="abs r4" style="xheight:23px"><span class="abs1">r4</span></span>
+</div>
+
+</body>
+</html>