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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
<style>
@page { size: 5in 3in; margin: 0.5in; }
body {
margin: 0;
font-size: 0.25in;
}
.flexbox {
display: block;
border: 0.25in solid black;
}
</style>
<div>Before Flexbox</div>
<div class="flexbox">
<div>1</div>
<div>2</div>
<div style="break-before: page">3</div>
<div>4</div>
</div>
<div>After Flexbox</div>