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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 definite height grid, forced row breaks, avoid-break grid</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;
+}
+
+.grid {
+  display: grid;
+  grid-template-columns: 30px 30px 30px;
+  grid-auto-rows: 30px;
+  grid-gap: 12px;
+  border:5px solid;
+}
+span { background:lime; border:1px solid black; }
+x { display:block; height:20px; }
+
+.t { border-bottom-width:0; }
+.b { border-top-width:0; }
+.m { border-top-width:0; border-bottom-width:0; }
+
+s { display:block; height:90px; }
+</style>
+</head>
+<body>
+
+<div class="columns" style="height: 100px/*two rows would fit in 1st column*/">
+<div style="padding-top:10px; background:grey">
+<s></s>
+<div class="grid t">
+<span><x></x></span>
+<span class="t"><x></x></span>
+<span class="t" style="background:cyan"><x></x></span>
+</div>
+<div style="height:40px;"></div>
+<div class="grid b" style="height:60px">
+<span class="b"><x></x></span>
+<span class="b" style="grid-area:1/3; height:6px; background:cyan"><x></x></span>
+<span style="grid-area:1/3; align-self:end; background:pink"><x></x></span>
+<span style="grid-row:1"><x></x></span>
+<span><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height:30px">
+<div style="padding-top:10px; background:grey">
+<s style="height:20px;"></s>
+<div style="height:90px;border:5px solid;"></div>
+</div></div>
+
+<div class="columns" style="height: 60px/*everything would fit in 1st column*/">
+<div style="padding-top:10px; background:grey">
+<div style="height:50px;"></div>
+<div class="grid t">
+<span><x></x></span>
+</div>
+<div style="height:60px; border:5px solid; border-top-width:0;">
+</div></div></div>
+
+<div class="columns" style="height: 100px/*everything would fit in 1st column*/">
+<div style="padding-top:10px; background:grey">
+<s></s>
+<div class="grid t">
+<span class="t"><x></x></span>
+<span class="t"><x></x></span>
+<span class="t" style="background:cyan"><x></x></span>
+</div>
+<div style="height:40px;"></div>
+<div class="grid b" style="padding-bottom:30px">
+<span class="b" style="grid-area:1/1; height:6px"><x></x></span>
+<span style="align-self:end; grid-area:1/1; background:pink"><x></x></span>
+<span class="b"><x></x></span>
+<span class="b" style="height:6px; background:cyan"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height: 100px/*everything would fit in 1st column*/">
+<div style="padding-top:10px; background:grey">
+<s></s>
+<div class="grid t">
+<span class="t"><x></x></span>
+<span class="t"><x></x></span>
+<span class="t" style="background:cyan"><x></x></span>
+</div>
+<div style="height:40px;"></div>
+<div class="grid b" style="padding-bottom:30px">
+<span class="b" style="grid-area:1/1; height:6px"><x></x></span>
+<span style="align-self:end; grid-area:1/1; background:pink"><x></x></span>
+<span class="b"><x></x></span>
+<span class="b" style="height:6px; background:cyan"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height: 100px/*everything would fit in 1st column*/">
+<div style="padding-top:10px; background:grey">
+<div style="height:90px;"></div>
+<div class="grid" style="padding-bottom:18px">
+<span style="height:35px"><x></x></span>
+<span style="grid-row:span 2"><x></x></span>
+<span style="height:35px; background:cyan"><x></x></span>
+<span style="grid-area:2/1; align-self:end; background:pink"><x></x></span>
+</div>
+</div></div>
+
+<div class="columns" style="height: 97px/*everything would fit in 1st column, except bottom border*/">
+<div style="padding-top:10px; background:grey">
+<div style="height:87px;"></div>
+<div class="grid t" style="padding-bottom:18px">
+<span style="height:35px"><x></x></span>
+<span style="grid-row:span 2"><x></x></span>
+<span style="height:35px; background:cyan"><x></x></span>
+<span style="grid-area:2/1; align-self:end; background:pink"><x></x></span>
+</div>
+<div class="grid b"></div>
+</div></div>
+
+<div class="columns" style="height: 80px/*one row fits in 1st column, two in 2nd column, but forced break there*/">
+<div style="padding-top:30px; background:grey">
+<div class="grid t">
+<span class="t"><x></x></span>
+<span class="t" style="background:cyan"><x></x></span>
+</div>
+<div class="grid m">
+<span class="b" style="grid-area:1/1; height:6px"><x></x></span>
+<span class="b" style="background:cyan"><x></x></span>
+<span style="grid-area:1/1; align-self:end; background:pink"><x></x></span>
+</div>
+<div style="height:50px"></div>
+<div class="grid b">
+<span><x></x></span>
+</div>
+</div></div>
+
+<div class="columns" style="height: 160px/*everything would fit in 1st column*/">
+<div style="padding-top:30px; background:grey">
+<div class="grid t">
+<span class="t" style="grid-row: span 2"><x></x></span>
+<span style="grid-row: span 2"><x></x></span>
+</div>
+<div style="height:53px"></div>
+<div style="height:18px; border:5px solid; border-top-width:0;">
+<span class="b" style="display:block;height:29px;width:28px"></span>
+</div>
+</div></div>
+
+</body>
+</html>