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+++ b/layout/reftests/css-grid/grid-placement-auto-col-dense-001-ref.html
@@ -0,0 +1,233 @@
+<!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 item auto placement: column dense</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1107778">
+  <style type="text/css">
+body,html { color:black; background:white; font-size:12px; padding:0; margin:0; }
+
+.grid {
+  height: 60px;
+  border: 1px solid green;
+  position: relative;
+  font-size: 12px;
+}
+.grid2 {
+  display: grid;
+  grid-auto-columns: 20px;
+  grid-auto-rows: 20px;
+  border: 1px solid green;
+}
+
+span {
+  position: absolute;
+  background: lime;
+  border: 1px solid black;
+  box-sizing: border-box;
+  width: 20px;
+  height: 20px;
+}
+x {
+  background: lime;
+  border: 1px solid black;
+}
+
+.test1 .a {
+  top: 0;
+  left: 20px;
+  width: 20px;
+  height: 20px;
+}
+.test1 .b {
+  top: 20px;
+  left: 20px;
+  width: 60px;
+  height: 20px;
+}
+.test1 .c {
+  top: 0;
+  left: 80px;
+  width: 60px;
+  height: 40px;
+}
+.test1 .d2 {
+  top: 20px;
+  left: 0px;
+}
+.test1 .e {
+  top: 20px;
+  left: 140px;
+}
+
+.test2 .a {
+  top: 0;
+  left: 20px;
+  width: 60px;
+  height: 20px;
+}
+.test2 .b {
+  top: 20px;
+  left: 20px;
+  width: 20px;
+  height: 20px;
+}
+.test2 .c {
+  top: 0;
+  left: 80px;
+  width: 60px;
+  height: 40px;
+}
+.test2 .d2 {
+  top: 20px;
+  left: 0px;
+}
+.test2 .e {
+  top: 20px;
+  left: 40px;
+}
+
+.test3 .a {
+  top: 0;
+  left: 0;
+  width: 60px;
+  height: 40px;
+}
+.test3 .b {
+  top: 40px;
+  left: 20px;
+  width: 60px;
+  height: 20px;
+}
+.test3 .c {
+  top: 0px;
+  left: 60px;
+  width: 60px;
+  height: 40px;
+}
+.test3 .d { top: 40px; left:0px; }
+.test3 .e {
+  top: 20px;
+  left: 120px;
+}
+.test3 .d2 {
+  top: 40px;
+  left: 80px;
+}
+
+.test4 .c {
+  top: 0;
+  left: 0px;
+  width: 60px;
+  height: 40px;
+}
+.test4 .d { top: 40px; }
+.test4 .e {
+  top: 20px;
+  left: 60px;
+}
+.test4 .d2 {
+  top: 40px;
+  left: 20px;
+}
+
+.test5 .c {
+  top: 20px;
+  left: 0;
+  width: 60px;
+  height: 20px;
+}
+.test5 .e {
+  top: 20px;
+  left: 60px;
+}
+.test5 .d2 {
+  top: 40px;
+  left: 0px;
+}
+
+.test6 { left: 0px; top: 20px;}
+.test6d2 {
+  top: 20px;
+  left: 140px;
+}
+.test6e {
+  top: 20px;
+  left: 160px;
+}
+    </style>
+</head>
+<body>
+
+<div class="grid test1">
+<span class="a">a</span>
+<span class="b">b</span>
+<span class="c">c</span>
+<span class="d">d</span>
+<span class="d2">D</span>
+<span class="e">e</span>
+</div>
+
+<div class="grid test2">
+<span class="a">a</span>
+<span class="b">b</span>
+<span class="c">c</span>
+<span class="d">d</span>
+<span class="d2">D</span>
+<span class="e">e</span>
+</div>
+
+<div class="grid test3">
+<span class="a">a</span>
+<span class="b">b</span>
+<span class="c">c</span>
+<span class="d">d</span>
+<span class="d2">D</span>
+<span class="e">e</span>
+</div>
+
+<div class="grid test4">
+<span class="c">c</span>
+<span class="d">d</span>
+<span class="d2">D</span>
+<span class="e">e</span>
+</div>
+
+<div class="grid test5">
+<span class="c">c</span>
+<span class="d">d</span>
+<span class="d2">D</span>
+<span class="e">e</span>
+</div>
+
+<div class="grid test1">
+<span class="a">a</span>
+<span class="b">b</span>
+<span class="c">c</span>
+<span class="test6">d</span>
+<span class="test6d2">D</span>
+<span class="test6e">e</span>
+</div>
+
+<!-- bug 1228984 test 1 -->
+<div class="grid2">
+<x style="grid-column: 1; grid-row: 1 / 3">1</x>
+<x style="grid-column: 2; grid-row: 1">2</x>
+<x style="grid-column: 3; grid-row: span 2">3</x>
+<x style="grid-column: 2; grid-row: 2">4</x>
+</div>
+
+<!-- bug 1228984 test 2 with "column dense" -->
+<div class="grid2">
+<x style="grid-column: 1; grid-row: 1 / 3">1</x>
+<x style="grid-column: 2; grid-row: 2 / 4">2</x>
+<x style="grid-column: 3; grid-row: 1 / 4">3</x>
+<x style="grid-column: 1; grid-row: 3">4</x>
+<x style="grid-column: 2; grid-row: 1">5</x>
+</div>
+
+</body>
+</html>