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diff --git a/layout/reftests/css-grid/grid-clamping-001-ref.html b/layout/reftests/css-grid/grid-clamping-001-ref.html
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@@ -0,0 +1,66 @@
+<!DOCTYPE HTML>
+<html><head>
+    <meta charset="utf-8">
+    <title>Reference: bug 1229999</title>
+    <style type="text/css">
+html,body { color:black; background-color:white; font-size:16px; padding:0; margin:0; }
+	
+.grid {
+  position: fixed;
+  bottom: 0;
+  display: grid;
+  grid-template-rows: 10000px;
+  grid-auto-rows: 1px;
+  grid-auto-columns: 10px;
+  border: 1px solid;
+}
+
+x {
+  position: absolute;
+  grid-row-start: span 2;
+  top:0; bottom:0; left:10px; width:20px;
+  background: grey;
+}
+    </style>
+</head>
+<body>
+
+    <div class="grid">
+        <span style="background:yellow"></span>
+        <span style="background:lime"></span>
+        <span style="background:blue"></span>
+        <span style="background:blue"></span>
+        <x></x>
+    </div>
+
+    <div class="grid" style="left:50px">
+        <span style="background:yellow"></span>
+        <span style="background:lime"></span>
+        <span style="background:blue"></span>
+        <x></x>
+    </div>
+
+    <div class="grid" style="left:100px">
+        <span style="background:yellow"></span>
+        <span style="background:yellow"></span>
+        <span style="background:blue"></span>
+        <x></x>
+    </div>
+
+    <div class="grid" style="left:150px">
+        <span style="background:yellow"></span>
+        <span style="background:yellow"></span>
+        <span style="background:blue"></span>
+        <x></x>
+    </div>
+
+    <div class="grid" style="left:200px">
+        <span style="background:yellow"></span>
+        <span style="background:yellow"></span>
+        <span style="background:blue"></span>
+        <x></x>
+    </div>
+
+
+</body>
+</html>