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diff --git a/layout/reftests/css-grid/grid-column-gap-003-ref.html b/layout/reftests/css-grid/grid-column-gap-003-ref.html
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+++ b/layout/reftests/css-grid/grid-column-gap-003-ref.html
@@ -0,0 +1,90 @@
+<!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-column-gap'</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1176792">
+  <style type="text/css">
+body,html { color:black; background:white; font-size:16px; padding:0; margin:0; }
+
+body { width: 800px; }
+.grid {
+  display: block;
+  border: dashed blue;
+  clear: left;
+}
+
+.c1 { grid-column: 1 / span 2; min-width:40px; margin-top:1px; }
+.r1 { grid-column: 2 / span 3; min-width:70px; margin-left:38px; }
+.c3 { grid-column: 3 / span 1; min-width:0; margin-left:138px; }
+
+span {
+  display: block;
+  background: gray;
+  border-style: solid;
+  border-width: 1px 3px 5px 7px;
+  padding: 1px 3px;
+  margin: 2px 5px 1px 5px;
+  justify-self: flex-start;
+}
+
+x { display:inline-block; width:10px; height:18px; }
+  </style>
+</head>
+<body>
+
+<div class="grid">
+<span class="c1" style="width:370px"><x></x></span>
+<span class="r1" style="margin-left:204px;"><x></x></span>
+</div>
+
+<div class="grid">
+<span class="c1" style="width:370px"><x></x></span>
+<span class="r1" style="margin-left:204px;"><x></x></span>
+<span class="c3" style="margin-left:404px; width:170px"><x></x></span>
+</div>
+
+<div class="grid">
+<span class="c1" style="width:370px"><x></x></span>
+<span class="r1" style="margin-left:204px;"><x></x></span>
+<span class="r1" style="margin-left:204px;"><x></x></span>
+<span class="r1" style="margin-left:204px;"><x></x></span>
+</div>
+
+<div class="grid">
+<span class="c1" style="width:505px"><x></x></span>
+<span class="r1" style="margin-left:136px;"><x></x></span>
+<span class="c3" style="margin-left:539px; width:103px"><x></x></span>
+</div>
+
+<div class="grid" style="width:500px;">
+<span class="c1" style="width:223px"><x></x></span>
+<span class="r1" style="margin-left:131px; width:348px"><x></x></span>
+<span class="r1" style="margin-left:131px; width:348px"><x></x></span>
+<span class="r1" style="margin-left:131px; width:348px"><x></x></span>
+</div>
+
+<div class="grid">
+<span class="c1" style="width:572px"><x></x></span>
+<span class="r1" style="margin-left:103px;"><x></x></span>
+<span class="c3" style="margin-left:606px; width:69px"><x></x></span>
+</div>
+
+<div class="grid">
+<span class="c1" style="width:100px"><x></x></span>
+<span class="r1" style="margin-left:204px; width:300px"><x></x></span>
+<span class="c3" style="margin-left:404px; width:170px"><x></x></span>
+</div>
+
+<div class="grid">
+<span class="c1" style="width:100px"><x></x></span>
+<span class="r1" style="margin-left:204px; width:300px"><x></x></span>
+<span class="c3" style="margin-left:404px; width:170px"><x></x></span>
+</div>
+
+
+</body>
+</html>