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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 with forced break propagation</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;
+}
+.no-border { border-style:none; }
+
+.grid {
+  display: grid;
+  grid-template-columns: 30px;
+  grid-auto-rows: 10px;
+  grid-gap: 2px;
+  border:5px solid;
+  height: 20px; /* create Class C break opportunities at both ends */
+  align-content: center;
+}
+.start {
+  align-content: start;
+}
+
+span { background:lime; border:1px solid black; }
+.bb { border-bottom-width:6px; }
+x { display:block; height: 40px; }
+.t { border-bottom-width:0; }
+.b { border-top-width:0; }
+.m {  border:5px solid; border-top-width:0; border-bottom-width:0; }
+.br1 { height:34px; border-width:5px; border-top-style:solid; }
+.br2 { height:4px; }
+.br3 { height:39px; }
+
+</style>
+</head>
+<body>
+
+<div class="columns" style="height:40px">
+<div style="background:grey">
+<div class="grid">
+<span class="break-before"></span>
+</div></div></div>
+
+<div class="columns" style="height:40px">
+<div style="background:grey">
+<div class="grid start">
+<span class="break-before"></span>
+</div></div></div>
+
+<div class="columns" style="height:40px">
+<div style="background:grey">
+<div class="br1"></div>
+<div class="grid b">
+<span class="avoid-break"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height:40px">
+<div style="background:grey">
+<div class="grid start">
+<span class="avoid-break"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height:40px">
+<div style="padding-top:1px; background:grey">
+<div class="br3"></div>
+<div class="grid">
+<span class="break-before"></span>
+</div></div></div>
+
+<div class="columns" style="height:40px">
+<div style="padding-top:1px; background:grey">
+<div class="br3"></div>
+<div class="grid start">
+<span class="break-before"></span>
+</div></div></div>
+
+<div class="columns" style="height:40px">
+<div style="padding-top:1px; background:grey">
+<div class="br1"></div>
+<div class="grid b">
+<span class="avoid-break"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height:40px">
+<div style="padding-top:1px; background:grey">
+<div class="grid start">
+<span class="avoid-break"><x></x></span>
+</div></div></div>
+
+<div class="columns" style="height:16px">
+<div style="background:grey">
+<div class="grid" style="height:10px">
+<span class="break-before"></span>
+</div></div></div>
+
+<div class="columns" style="height:16px">
+<div style="padding-top:1px; background:grey">
+<div class="br2"></div>
+<div class="grid" style="height:10px">
+<span class="break-before"></span>
+</div></div></div>
+
+<div class="columns" style="height:10px">
+<div style="background:grey">
+<div class="grid" style="height:10px">
+<span class="break-before"></span>
+</div></div></div>
+
+<div class="columns" style="height:10px">
+<div style="padding-top:1px; background:grey">
+<div class="br2"></div>
+<div class="grid" style="height:10px">
+<span class="break-before"></span>
+</div></div></div>
+
+<div class="columns" style="height:0px">
+<div style="background:grey">
+<div class="grid" style="height:10px">
+<span class="break-before"></span>
+</div></div></div>
+
+<div class="columns" style="height:0px; margin-top:20px">
+<div style="background:grey">
+<div style="height:1px; overflow:hidden"></div>
+<div class="grid" style="height:10px">
+<span class="break-before"></span>
+</div></div></div>
+
+<div class="columns no-border" style="height:0px; margin-top:20px">
+<div style="height:1px; overflow:hidden"></div>
+<div style="height:5px; overflow:hidden; background:black; "></div>
+<div class="grid m" style="height:10px;grid-auto-rows: 0px; align-content:start;">
+<span class="bb"></span>
+</div></div>
+
+<div class="columns no-border" style="height:0px; margin-top:20px">
+<div style="">
+<div style="height:1px; overflow:hidden"></div>
+<div style="height:5px; overflow:hidden; background:black; "></div>
+</div>
+<div style="height:7px; width:30px; margin-left:5px; overflow:hidden; background:black;"></div>
+<div class="grid m" style="height:10px;grid-auto-rows: 0px; align-content:start;">
+<span class="bb"></span>
+</div></div>
+
+<div class="columns no-border" style="height:0px; margin-top:20px">
+<div style="height:1px; overflow:hidden; position:relative"></div>
+<div style="border:5px solid; height:1px; overflow:hidden; ">
+<div style="height:7px; width:30px; overflow:hidden;  position:absolute; background:black;"></div>
+</div>
+</div>
+</div>
+
+<div class="columns no-border" style="height:0px; margin-top:20px">
+<div style="padding-top:1px; ">
+<div style="height:1px; overflow:hidden"></div>
+<div class="grid" style="height:1px;grid-auto-rows: 1px;">
+<span class="break-before bb"></span>
+<span class="break-before bb"></span>
+</div></div></div>
+
+<div class="columns no-border" style="height:0px; margin-top:20px">
+<div style="padding-top:1px; ">
+<div style="height:1px; overflow:hidden"></div>
+<div class="grid" style="height:1px;grid-auto-rows: 11px;">
+<span class="break-before bb"></span>
+<span class="break-before bb"></span>
+</div></div></div>
+
+<div class="columns no-border" style="height:0px; margin-top:20px">
+<div style="padding-top:1px; ">
+<div style="height:1px; overflow:hidden"></div>
+<div class="grid" style="height:1px;grid-auto-rows: 11px;">
+<span class="break-before bb" style="grid-row:span 2"></span>
+<span class="break-before bb"></span>
+</div></div></div>
+
+
+<div class="columns no-border" style="height:0px; margin-top:20px">
+<div style="padding-top:1px; ">
+<div style="height:1px; overflow:hidden"></div>
+<div class="grid" style="height:1px;grid-auto-rows: 11px;">
+<span class="break-before bb"></span>
+<span class="break-before bb" style="grid-row:span 2"></span>
+</div></div></div>
+
+</body>
+</html>