<!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, 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;
}

.grid {
  display: grid;
  grid-template-columns: 30px 30px 30px;
  grid-auto-rows: 30px;
  grid-gap: 12px;
  border:5px solid;
  border-top-width:0;
  align-content: start;
}
span { padding-top:20px; background:lime; border:1px solid black; }

.t { border-bottom-width:0; }
.b { border-top-width:0; }
.m { border-top-width:0; border-bottom-width:0; }

i { display:block; height:10px; margin-top:7px; background:blue; }
</style>
</head>
<body>

<div class="columns" style="height: 94px">
<div style="background:grey">
<div class="grid t" style="grid-template-rows: 1fr; grid-gap:0; height:82px">
<span style="height:50px;"><i style="height:54px"></i></span>
<span style="height:60px"><i></i><i></i><i></i></span>
</div>
<div class="grid b" style="grid-template-rows: 50px; grid-gap:0;">
<span></span>
</div>
</div></div>

<div class="columns" style="height: 94px">
<div style="background:grey">
<div class="grid t" style="grid-template-rows: 1fr; grid-gap:0; height:82px">
<span class="t"></span>
<span style="height:50px;"><i style="height:54px"></i></span>
<span style="height:60px"><i></i><i></i><i></i></span>
</div>
<div style="height:12px"></div>
<div class="grid b" style="grid-template-rows: 50px; grid-gap:0;">
<span class="b"></span>
<span class="m" style="padding:0; height:6px; background:blue; margin: 0 1px; border-width:0"></span>
</div>
</div></div>

<div class="columns" style="height: 94px">
<div style="background:grey">
<div class="grid t" style="grid-template-rows: 1fr; grid-gap:0; height:82px">
<span class="t"></span>
<span style="height:50px"><i style="height:54px"></i></span>
<span style="height:60px"><i></i><i></i><i></i></span>
</div>
<div class="grid m" style="grid-template-rows: 80px; grid-gap:0;">
<span class="m"></span>
<span class="m" style="padding:0; height:6px; background:blue; margin: 0 1px; border-width:0"></span>
</div>
<div class="grid b" style="grid-template-rows: 30px; grid-gap:0;">
<span class="b"></span>
</div>
</div></div>

<div class="columns" style="height: 94px">
<div style="background:grey">
<div class="grid t" style="grid-template-rows: 5px; grid-row-gap:0; height:5px">
<span class="t" style="grid-column:3"></span>
</div>
<div style="height:88px"></div>
<div class="grid m" style="grid-template-rows: 1fr; grid-row-gap:0; height:82px">
<span style="height:50px"><i style="height:54px"></i></span>
<span style="height:60px"><i></i><i></i><i></i></span>
<span class="m"></span>
</div>
<div class="grid m" style="grid-template-rows: 92px; grid-row-gap:0;">
<span class="m" style="padding:0; height:6px; background:blue; margin: 0 1px; border-width:0"></span>
<span class="m" style="grid-column:3"></span>
</div>
<div class="grid b" style="grid-template-rows: 30px; grid-row-gap:0;">
<span class="b" style="grid-column:3"></span>
</div>
</div></div>

<div class="columns" style="height: 94px">
<div style="background:grey">
<div class="grid t" style="grid-template-rows: 5px; grid-row-gap:0; height:5px">
<span class="t"></span>
</div>
<div style="height:88px"></div>
<div class="grid m" style="grid-template-rows: 1fr; grid-row-gap:0; height:82px">
<span class="m"></span>
<span style="height:50px"><i style="height:54px"></i></span>
<span style="height:60px"><i></i><i></i><i></i></span>
</div>
<div class="grid m" style="grid-template-rows: 92px; grid-row-gap:0;">
<span class="m"></span>
<span class="m" style="padding:0; height:6px; background:blue; margin: 0 1px; border-width:0"></span>
</div>
<div class="grid b" style="grid-template-rows: 30px; grid-row-gap:0;">
<span class="b"></span>
</div>
</div></div>

</body>
</html>