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+<!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: Placement involving negative line numbers</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1215957">
+  <style type="text/css">
+body,html { color:black; background:white; font-size:12px; padding:0; margin:0; }
+
+.grid {
+  display: grid;
+  position: relative;
+  border: 1px solid;
+  grid-auto-rows: 15px;
+  grid-gap: 1px;
+}
+.t1 {
+  grid-template-columns: 40px 40px 40px 40px 60px 60px 60px 40px 40px 40px 40px 40px;
+
+}
+.t2 {
+  grid-template-columns: 40px 40px 40px 40px 40px 60px 60px 60px 40px 40px 40px 40px;
+}
+.t3 {
+  grid-template-columns: 40px 40px 40px 40px 60px 60px 60px 40px 40px 40px 40px 40px 40px;
+}
+
+x {
+  background: lime;
+  border: 1px solid;
+}
+y {
+  position: absolute;
+  border: 1px solid blue;
+  bottom:0;height:0;left:0;right:0;
+  grid-row-end:span 1!important;
+}
+.a2 { bottom:2px; }
+.a3 { bottom:4px; }
+.a4 { bottom:6px; }
+.a5 { bottom:8px; }
+
+  </style>
+</head>
+<body>
+
+<pre>
+grid-template-columns: 60px [A] 60px 60px;
+grid-auto-columns: 40px;
+grid-gap: 1px;
+</pre>
+
+<pre>grid-column-start:</pre>
+<div class="grid t1" style="padding-right:13px; border-right-width:5px">
+<x style="grid-row:1; grid-column-start:5; background:grey"></x>
+<x style="grid-row:2; grid-column-start:8">-1</x>
+<x style="grid-row:3; grid-column-start:8">4</x>
+<x style="grid-row:3; grid-column-start:7">-2</x>
+<x style="grid-row:3; grid-column-start:6">-3</x>
+<x style="grid-row:3; grid-column-start:5">-4</x>
+<x style="grid-row:3; grid-column-start:4">-5</x>
+<x style="grid-row:4; grid-column-start:6">A -1</x>
+<x style="grid-row:4; grid-column-start:4">B -1</x>
+<x style="grid-row:5; grid-column-start:4">A -2</x>
+<x style="grid-row:6; grid-column-start:3">A -3</x>
+<x style="grid-row:6; grid-column-start:2">A -4</x>
+<x style="grid-row:6; grid-column-start:1">A -5</x>
+<x style="grid-row:7; grid-column-start:6">A</x>
+<x style="grid-row:7; grid-column-start:9">B</x>
+<x style="grid-row:8; grid-column-start:6">A 1</x>
+<x style="grid-row:8; grid-column-start:9">A 2</x>
+<x style="grid-row:8; grid-column-start:10">A 3</x>
+<x style="grid-row:8; grid-column-start:11">A 4</x>
+<x style="grid-row:8; grid-column-start:12">A 5</x>
+<y style="grid-row:2; grid-column-start:8"></y>
+<y style="grid-row:3; grid-column-start:8"></y>
+<y style="grid-row:3; grid-column-start:7" class="a2"></y>
+<y style="grid-row:3; grid-column-start:6" class="a3"></y>
+<y style="grid-row:3; grid-column-start:5" class="a4"></y>
+<y style="grid-row:3; grid-column-start:4" class="a5"></y>
+<y style="grid-row:4; grid-column-start:6"></y>
+<y style="grid-row:4; grid-column-start:4" class="a2"></y>
+<y style="grid-row:5; grid-column-start:4"></y>
+<y style="grid-row:6; grid-column-start:3"></y>
+<y style="grid-row:6; grid-column-start:2" class="a2"></y>
+<y style="grid-row:6; grid-column-start:1" class="a3"></y>
+<y style="grid-row:7; grid-column-start:6"></y>
+<y style="grid-row:7; grid-column-start:9" class="a2"></y>
+<y style="grid-row:8; grid-column-start:6"></y>
+<y style="grid-row:8; grid-column-start:9" class="a2"></y>
+<y style="grid-row:8; grid-column-start:10" class="a3"></y>
+<y style="grid-row:8; grid-column-start:11" class="a4"></y>
+<y style="grid-row:8; grid-column-start:12" class="a5"></y>
+</div>
+
+<pre>grid-column-end:</pre>
+<div class="grid t2" style="padding-left:13px;">
+<x style="grid-row:1; grid-column-start:6; background:grey"></x>
+<x style="grid-row:2; grid-column-start:8">-1</x>
+<x style="grid-row:3; grid-column-start:8">4</x>
+<x style="grid-row:3; grid-column-start:7">-2</x>
+<x style="grid-row:3; grid-column-start:6">-3</x>
+<x style="grid-row:3; grid-column-start:5">-4</x>
+<x style="grid-row:3; grid-column-start:4">-5</x>
+<x style="grid-row:4; grid-column-start:6">A -1</x>
+<x style="grid-row:4; grid-column-start:4">B -1</x>
+<x style="grid-row:5; grid-column-start:4">A -2</x>
+<x style="grid-row:6; grid-column-start:3">A -3</x>
+<x style="grid-row:6; grid-column-start:2">A -4</x>
+<x style="grid-row:6; grid-column-start:1">A -5</x>
+<x style="grid-row:7; grid-column-start:6">A</x>
+<x style="grid-row:7; grid-column-start:9">B</x>
+<x style="grid-row:8; grid-column-start:6">A 1</x>
+<x style="grid-row:8; grid-column-start:9">A 2</x>
+<x style="grid-row:8; grid-column-start:10">A 3</x>
+<x style="grid-row:8; grid-column-start:11">A 4</x>
+<x style="grid-row:8; grid-column-start:12">A 5</x>
+<y style="grid-row:2; grid-column-end:9"></y>
+<y style="grid-row:3; grid-column-end:9"></y>
+<y style="grid-row:3; grid-column-end:8" class="a5"></y>
+<y style="grid-row:3; grid-column-end:7" class="a4"></y>
+<y style="grid-row:3; grid-column-end:6" class="a3"></y>
+<y style="grid-row:3; grid-column-end:5" class="a2"></y>
+<y style="grid-row:4; grid-column-end:7"></y>
+<y style="grid-row:4; grid-column-end:5" class="a2"></y>
+<y style="grid-row:5; grid-column-end:5"></y>
+<y style="grid-row:6; grid-column-end:4"></y>
+<y style="grid-row:6; grid-column-end:3" class="a2"></y>
+<y style="grid-row:6; grid-column-end:2" class="a3"></y>
+<y style="grid-row:7; grid-column-end:7"></y>
+<y style="grid-row:7; grid-column-end:10" class="a2"></y>
+<y style="grid-row:8; grid-column-end:7"></y>
+<y style="grid-row:8; grid-column-end:10" class="a2"></y>
+<y style="grid-row:8; grid-column-end:11" class="a3"></y>
+<y style="grid-row:8; grid-column-end:12" class="a4"></y>
+<y style="grid-row:8; grid-column-end:13" class="a5"></y>
+</div>
+
+<pre>grid-column: / span A 2</pre>
+<div class="grid t3">
+<x style="grid-row:1;  grid-column:5; background:grey"></x>
+<x style="grid-row:2;  grid-column:8/span 2;">-1</x>
+<x style="grid-row:3;  grid-column:8/span 2;">4</x>
+<x style="grid-row:4;  grid-column:7/span 3;">-2</x>
+<x style="grid-row:5;  grid-column:6/span 4;">-3</x>
+<x style="grid-row:6;  grid-column:5/span 4;">-4</x>
+<x style="grid-row:7;  grid-column:4/span 5;">-5</x>
+<x style="grid-row:8;  grid-column:6/span 4;">A -1</x>
+<x style="grid-row:9;  grid-column:4/span 5;">B -1</x>
+<x style="grid-row:10; grid-column:4/span 5;">A -2</x>
+<x style="grid-row:11; grid-column:3/span 6;">A -3</x>
+<x style="grid-row:12; grid-column:2/span 7;">A -4</x>
+<x style="grid-row:13; grid-column:1/span 8;">A -5</x>
+<x style="grid-row:14; grid-column:6/span 4;">A</x>
+<x style="grid-row:15; grid-column:9/span 1;">B</x>
+<x style="grid-row:16; grid-column:6/span 4;">A 1</x>
+<x style="grid-row:17; grid-column:9/span 2;">A 2</x>
+<x style="grid-row:18; grid-column:10/span 2;">A 3</x>
+<x style="grid-row:19; grid-column:11/span 2;">A 4</x>
+<x style="grid-row:20; grid-column:12/span 2;">A 5</x>
+<y style="grid-row:2;  grid-column:8/span 2;"></y>
+<y style="grid-row:3;  grid-column:8/span 2;"></y>
+<y style="grid-row:4;  grid-column:7/span 3;"></y>
+<y style="grid-row:5;  grid-column:6/span 4;"></y>
+<y style="grid-row:6;  grid-column:5/span 4;"></y>
+<y style="grid-row:7;  grid-column:4/span 5;"></y>
+<y style="grid-row:8;  grid-column:6/span 4;"></y>
+<y style="grid-row:9;  grid-column:4/span 5;"></y>
+<y style="grid-row:10; grid-column:4/span 5;"></y>
+<y style="grid-row:11; grid-column:3/span 6;"></y>
+<y style="grid-row:12; grid-column:2/span 7;"></y>
+<y style="grid-row:13; grid-column:1/span 8;"></y>
+<y style="grid-row:14; grid-column:6/span 4;"></y>
+<y style="grid-row:15; grid-column:9/span 1;"></y>
+<y style="grid-row:16; grid-column:6/span 4;"></y>
+<y style="grid-row:17; grid-column:9/span 2;"></y>
+<y style="grid-row:18; grid-column:10/span 2;"></y>
+<y style="grid-row:19; grid-column:11/span 2;"></y>
+<y style="grid-row:20; grid-column:12/span 2;"></y>
+</div>
+
+</body>
+</html>