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@@ -0,0 +1,169 @@
+<!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 Test: grid item auto placement: column dense</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1107778">
+  <link rel="help" href="https://drafts.csswg.org/css-grid/#auto-placement-algo">
+  <link rel="match" href="grid-placement-auto-col-dense-001-ref.html">
+  <style type="text/css">
+body,html { color:black; background:white; font-size:12px; padding:0; margin:0; }
+
+.grid {
+  display: grid;
+  border: 1px solid green;
+  grid-template-columns: 20px 20px 20px 20px;
+  grid-template-rows: 20px 20px 20px;
+  grid-auto-flow: dense column;
+  grid-auto-columns: 20px;
+  grid-auto-rows: 20px;
+}
+.grid2 {
+  display: grid;
+  grid-auto-columns: 20px;
+  grid-auto-rows: 20px;
+  grid-auto-flow: column dense;
+  border: 1px solid green;
+}
+
+span {
+  background: lime;
+  border: 1px solid;
+}
+
+.test1 .a {
+  grid-row: 1;
+  grid-column: 2 / span 1;
+}
+.test1 .b {
+  grid-row: 2;
+  grid-column: 2 / span 3;
+}
+.test1 .c, .test2 .c {
+  grid-row: 1 / span 2;
+  grid-column: auto / span 3;
+}
+
+.test2 .a {
+  grid-row: 1;
+  grid-column: 2 / span 3;
+}
+.test2 .b {
+  grid-row: 2;
+  grid-column: 2 / span 1;
+}
+
+.test3 {
+  grid-template-areas:
+    'a a a . '
+    'a a a . '
+    '. b b . '
+  ;
+}
+.test3 .a {
+  grid-area: a;
+}
+.test3 .b {
+  grid-column: 2 / span 3; 
+  grid-row: b;
+}
+.test3 .c {
+  grid-row: auto / span 2;
+  grid-column: auto / span 3;
+}
+
+.test4 .c {
+  grid-row: auto / span 2;
+  grid-column: auto / span 3;
+}
+
+.test5 .c {
+  grid-row-start: 2;
+  grid-column: auto / span 3;
+}
+
+.test6 {
+  grid-row-start: 2;
+  grid-column: auto / span X;
+}
+
+.e {
+  grid-row-start: 2;
+  grid-column: auto / span 1;
+}
+    </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="d">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="d">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="d">D</span>
+<span class="e">e</span>
+</div>
+
+<div class="grid test4">
+<span class="c">c</span>
+<span class="d">d</span>
+<span class="d">D</span>
+<span class="e">e</span>
+</div>
+
+<div class="grid test5">
+<span class="c">c</span>
+<span class="d">d</span>
+<span class="d">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="test6">D</span>
+<span class="e">e</span>
+</div>
+
+<!-- bug 1228984 test 1 -->
+<div class="grid2">
+<span style="grid-column: 1; grid-row: 1 / 3">1</span>
+<span style="grid-column: 2; grid-row: 1">2</span>
+<span style="grid-row: span 2">3</span>
+<span style="grid-row: 2">4</span>
+</div>
+
+<!-- bug 1228984 test 2 with "column dense" -->
+<div class="grid2">
+<span style="grid-row: 1 / 3">1</span>
+<span style="grid-row: 2 / 4">2</span>
+<span style="grid-row: 1 / 4">3</span>
+<span style="">4</span>
+<span style="">5</span>
+</div>
+
+</body>
+</html>