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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="David Shin" href="mailto:dshin@mozilla.com">
<style>
body { margin: 0; }
.vert-cb {
position: relative;
width: 150px;
height: 60px;
writing-mode: vertical-lr;
direction: rtl;
background: lightblue;
padding: 1px 2px 3px 4px;
margin-bottom: 2px;
}
.horiz-parent {
width: 120px;
height: 100%;
box-sizing: border-box;
border: solid orange;
border-width: 4px 3px 2px 1px;
writing-mode: horizontal-tb;
}
.abspos-equivalent {
height: 40px;
background: pink;
border: solid black;
border-width: 2px 1px 4px 3px;
}
</style>
<body>
<div class="vert-cb">
<div class="horiz-parent">
<div class="abspos-equivalent" style="width: max-content">Hello</div>
</div>
</div>
<div class="vert-cb">
<div class="horiz-parent">
<div class="abspos-equivalent" style="width: 100px">Hello</div>
</div>
</div>
<div class="vert-cb">
<div class="horiz-parent">
<canvas class="abspos-equivalent" height="40px" width="100px"></canvas>
</div>
</div>
<div class="vert-cb">
<div class="horiz-parent">
<img src="broken" class="abspos-equivalent" height="40px" width="100px">
</div>
</div>
</body>