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<!DOCTYPE html>
<!--
Any copyright is dedicated to the Public Domain.
-->
<html>
<head>
<style>
div.button {
display: inline-block;
border: 0;
padding: 0;
font: 10px sans-serif;
text-align: center;
vertical-align: top;
color: black;
background: gray;
}
div.p80 {
width: 80%;
background: pink;
}
div.p100 {
width: 100%;
background: yellow;
}
</style>
</head>
<body>
<!--Button has explicit width for us to resolve against: -->
<div class="button" style="width: 100px">
<div class="p80">abc</div>
</div>
<div class="button" style="width: 100px">
<div class="p100">abc</div>
</div>
<!--Button is using intrinsic width: -->
<div class="button">
<div class="p80">abc</div>
</div>
<div class="button">
<div class="p100">abc</div>
</div>
</body>
</html>