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diff --git a/layout/reftests/css-grid/grid-row-gap-003.html b/layout/reftests/css-grid/grid-row-gap-003.html
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@@ -0,0 +1,102 @@
+<!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: 'grid-row-gap' sideways-lr</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1227099">
+  <link rel="help" href="http://dev.w3.org/csswg/css-grid/#gutters">
+  <link rel="match" href="grid-row-gap-003-ref.html">
+  <style type="text/css">
+html,body {
+  color:black; background-color:white; font-size:16px; padding:0; margin:0;
+}
+
+.grid {
+  display: grid;
+  grid-auto-flow: column;
+  grid-auto-rows: minmax(1px,auto);
+  grid-template-columns: 0px 7px;
+  border: 2px solid black;
+  float: left;
+  writing-mode: sideways-lr;
+  margin-right:16px
+}
+
+.grid :last-child { background:grey; }
+.grid :nth-child(2) { background:pink; }
+
+x { background: lime; height:7px; }
+
+  </style>
+</head>
+<body>
+
+<script>
+document.body.style.display = "none";
+var align = [
+   "stretch",
+   // FIXME: When https://github.com/w3c/csswg-drafts/issues/1002 is implemented.
+   // "stretch end",
+   // "stretch center",
+   // "stretch safe end",
+   // "stretch unsafe end",
+   "safe start",
+   "safe end",
+   "safe center",
+   "unsafe start",
+   "unsafe end",
+   "unsafe center",
+   "space-between",
+   // FIXME: https://github.com/w3c/csswg-drafts/issues/1002
+   // "space-between end",
+   // "space-between start",
+   // "space-between safe end",
+   "space-around",
+   // FIXME: https://github.com/w3c/csswg-drafts/issues/1002
+   // "space-around center",
+   // "space-around right",
+   // "space-around safe right",
+   // "space-around left",
+   "space-evenly",
+   // "space-evenly end",
+];
+var rows = [ "0", "1", "2", "3", "8", "9" ];
+var heights = [ "auto", "0", "1", "5", "6" ];
+var gaps = [ "1", "2" ];
+for (var j = 0; j < align.length; ++j) {
+  // document.body.appendChild(document.createTextNode(align[j])); // for debugging
+  var chunk = document.createElement('div');
+  chunk.setAttribute("style", "border:1px solid; padding:2px 10px; overflow:hidden; float:left;");
+  for (var c = 0; c < rows.length; ++c) {
+    for (var w = 0; w < heights.length; ++w) {
+      // set this to true if you want to see all tests
+      var run_test = heights[w] == "auto" || heights[w] < rows[c] || rows[c] == 0 || rows[c] == 1;
+      if (run_test) {
+        for (var g = 0; g < gaps.length; ++g) {
+          var grid = document.createElement('div');
+          if (heights[w] != "auto")
+            grid.style.width = heights[w]+"px";
+          grid.style.gridRowGap = gaps[g]+"px";
+          grid.className = "grid";
+          grid.style.alignContent = align[j];
+          var span = document.createElement('span');
+          span.style.gridRow = "1 / span " + rows[c];
+          grid.appendChild(span);
+          for (var x = 0; x < rows[c]; ++x) {
+            grid.appendChild(document.createElement('x'));
+          }
+          chunk.appendChild(grid);
+        }
+      }
+    }
+  }
+  document.body.appendChild(chunk);
+}
+document.body.style.display = "";
+</script>
+
+</body>
+</html>