<!DOCTYPE html>
<title>Reference</title>
<style>
/* establish context */
.container {
clear: both;
padding: 10px;
width: 0;
}
span {
display: inline-block;
width: 20px;
height: 20px;
background-color: blue;
}
/* visualize size contribution */
.container > div {
float: left;
border: solid orange 20px;
border-style: none solid;
}
.container > div > div {
border-right: solid 20px aqua;
writing-mode: vertical-rl;
width: 40px;
height: 20px;
}
/* controls for min-width */
/* content = 100% = 80px = 4ch + border */
/* choose sizes that are larger than content to see if how they take effect */
.container > div > .raw-percent {
width: 120px;
}
.container > div > .calc-percent,
.container > div > .no-percent {
width: 160px;
}
</style>
<!-- calculating min-content widths -->
<div class='container'>
<div><div class="control"><span></span></div></div>
</div>
<div class='container'>
<div style='width: 60px;'><div class="raw-percent"><span></span></div></div>
</div>
<div class='container'>
<div style='width: 60px;'><div class="calc-percent"><span></span></div></div>
</div>
<div class='container'>
<div><div class="no-percent"><span></span></div></div>
</div>
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