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diff --git a/layout/reftests/css-grid/grid-row-gap-001-ref.html b/layout/reftests/css-grid/grid-row-gap-001-ref.html
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+++ b/layout/reftests/css-grid/grid-row-gap-001-ref.html
@@ -0,0 +1,91 @@
+<!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-row-gap'</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1176792">
+  <style type="text/css">
+html,body {
+    color:black; background-color:white; font-size:16px; padding:0; margin:0;
+}
+separator { clear:both; display:block; height:6px; }
+
+.grid {
+  display: grid;
+  float: left;
+  position: relative;
+  border: 1px solid;
+  border-block-start: 2px solid blue;
+  grid-template:  3px 1px 5px 1px 7px / 11px 7px 5px;
+  padding: 1px 1px 3px 2px;
+  margin-right: 4px;
+  width: 40px;
+  height: 40px;
+}
+
+item1,item2,item3 {
+  display: block;
+  position: relative;
+  background: grey;
+  justify-self: stretch;
+  align-self: stretch;
+}
+
+item1 { grid-area: 1 / 1; }
+item2 { grid-area: 3 / 2; }
+item3 { grid-area: 5 / 3; }
+
+.hl  { writing-mode: horizontal-tb; direction:ltr; }
+.hr  { writing-mode: horizontal-tb; direction:rtl; }
+.vl  { writing-mode: vertical-lr; }
+.vr  { writing-mode: vertical-rl; }
+.vlr { writing-mode: vertical-lr; direction:rtl; }
+.vrl { writing-mode: vertical-rl; direction:ltr; }
+
+.aend *, .aflexend * { offset-block-start:23px; }
+.acenter * { offset-block-start:11.5px;  }
+
+
+.aspace-between item2 { offset-block-start:11.5px; }
+.aspace-between item3 { offset-block-start:23px; }
+
+.aspace-around item1 { offset-block-start:4.1666px; }
+.aspace-around item2 { offset-block-start:11.5px; }
+.aspace-around item3 { offset-block-start:18.8333px; }
+
+.aspace-evenly item1 { offset-block-start:6.25px; }
+.aspace-evenly item2 { offset-block-start:11.5px; }
+.aspace-evenly item3 { offset-block-start:16.75px; }
+
+.astretch2 { grid-template-rows: 1fr 1px 5px 1px 7px; }
+.astretch3 { grid-template-rows: 14.5px 1px 16.3333px 1px 7px; }
+.astretch4 { grid-template-rows: 10.66666px 1px 12.66666px 1px 14.66666px; }
+
+</style>
+</head>
+<body>
+
+<script>
+var gridwm = [ "hl", "hr", "vl", "vr", "vlr", "vrl" ];
+var test = [ "start", "end", "flexstart", "flexend", "center", "left", "right",
+             "space-between", "space-around", "space-evenly",
+             "stretch1", "stretch2", "stretch3", "stretch4" ];
+for (var k = 0; k < test.length; ++k) {
+  for (var i = 0; i < gridwm.length; ++i) {
+      var div = document.createElement("div");
+      div.className = "grid a" + test[k] + " " + gridwm[i];
+      div.appendChild(document.createElement("item1"));
+      div.appendChild(document.createElement("item2"));
+      div.appendChild(document.createElement("item3"));
+      document.body.appendChild(div)
+  }
+    document.body.appendChild(document.createElement("separator"));
+}
+</script>
+
+
+</body>
+</html>