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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: Fragmentation of height:auto grid, not top-of-page</title>
+  <link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1144096">
+  <style type="text/css">
+html,body {
+    color:black; background-color:white; font-size:16px; padding:0; margin:0;
+}
+body { overflow:hidden; }
+
+.columns {
+  position:relative;
+     -moz-columns: 5;
+      -ms-columns: 5;
+  -webkit-columns: 5;
+          columns: 5;
+     -moz-column-fill: auto;
+      -ms-column-fill: auto;
+  -webkit-column-fill: auto;
+          column-fill: auto;
+  border: 2px dashed;
+  margin-bottom: 5px;
+}
+
+.block {
+  border:5px solid;
+}
+.grid {
+  display: grid;
+  grid-template-columns: 30px 30px 30px;
+  grid-template-rows: 50px;
+  grid-column-gap: 12px;
+  border:5px solid;
+}
+.t { border-bottom-width:0; }
+.b { border-top-width:0; }
+span { background:lime; border:1px solid black; }
+x { display:block; height:20px; }
+br { page-break-before:always; break-before:always; }
+</style>
+</head>
+<body>
+
+<div class="columns" style="height: 130px/*fragmentainer ends in the end border*/">
+<div style="padding-top:10px; background:grey">
+<div class="grid t">
+<span><x></x></span>
+<span class="t"><x></x></span>
+<span style="background:cyan" class="t"><x></x></span>
+</div>
+<br>
+<div class="grid b">
+<span><x></x></span>
+<span class="b"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:3; height:11px; background:cyan"><x></x></span>
+<span style="grid-row:1; grid-column:3; align-self:end; background:pink"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height: 18px/*fragmentainer ends in the end border*/">
+<div style="padding-top:10px; background:grey">
+<div class="block">
+</div></div></div>
+
+<div class="columns" style="height: 20px/*fragmentainer ends in the end border*/">
+<div style="padding-top:10px; background:grey">
+<div class="block" style="height:2px/*creates a Class C break opportunity at the end*/">
+</div></div></div>
+
+<div class="columns" style="height: 100px/*fragmentainer ends in the last row*/">
+<div style="padding-top:10px; background:grey">
+<div class="grid t">
+<span class="t"><x></x></span>
+<span class="t"><x></x></span>
+<span style="background:cyan" class="t"><x></x></span>
+</div>
+<br>
+<div class="grid b">
+<span class="b"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:1; height:11px;"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:3; height:11px; background:cyan"><x></x></span>
+<span style="grid-row:1; grid-column:1; align-self:end; background:pink"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height: 70px/*fragmentainer ends in the grid gap between the rows */">
+<div style="padding-top:10px; background:grey">
+<div class="grid t">
+<span class="t"><x></x></span>
+<span class="t"><x></x></span>
+<span style="background:cyan" class="t"><x></x></span>
+</div>
+<div class="grid b">
+<span class="b"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:1; height:11px;"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:3; height:11px; background:cyan"><x></x></span>
+<span style="grid-row:1; grid-column:1; align-self:end; background:pink"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height: 40px/*fragmentainer ends in the first row*/; margin-bottom:30px">
+<div style="padding-top:10px; background:grey">
+<div class="grid t">
+<span class="t"><x></x></span>
+<span class="t"><x></x></span>
+<span style="background:cyan" class="t"><x></x></span>
+</div>
+<div class="grid b">
+<span class="b"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:1; height:11px;"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:3; height:11px; background:cyan"><x></x></span>
+<span style="grid-row:1; grid-column:1; align-self:end; background:pink"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height: 13px/*fragmentainer ends in the grid start border */; margin-bottom:60px">
+<div style="padding-top:10px; background:grey">
+<div class="grid t">
+<span class="t"><x></x></span>
+<span class="t"><x></x></span>
+<span style="background:cyan" class="t"><x></x></span>
+</div>
+<div class="grid b">
+<span class="b"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:1; height:11px;"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:3; height:11px; background:cyan"><x></x></span>
+<span style="grid-row:1; grid-column:1; align-self:end; background:pink"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height: 8px/*fragmentainer ends above the grid*/; margin-bottom:60px">
+<div style="padding-top:10px; background:grey">
+<div class="grid t">
+<span class="t"><x></x></span>
+<span class="t"><x></x></span>
+<span style="background:cyan" class="t"><x></x></span>
+</div>
+<div class="grid b">
+<span class="b"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:1; height:11px;"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:3; height:11px; background:cyan"><x></x></span>
+<span style="grid-row:1; grid-column:1; align-self:end; background:pink"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height: 0px/*zero height fragmentainer*/; margin-bottom:60px">
+<div style="padding-top:10px; background:grey">
+<div class="grid t">
+<span class="t"><x></x></span>
+<span class="t"><x></x></span>
+<span style="background:cyan" class="t"><x></x></span>
+</div>
+<div class="grid b">
+<span class="b"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:1; height:11px;"><x></x></span>
+<span class="b" style="grid-row:1; grid-column:3; height:11px; background:cyan"><x></x></span>
+<span style="grid-row:1; grid-column:1; align-self:end; background:pink"><x></x></span>
+</div></div></div>
+
+
+</body>
+</html>