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Test Info:

<!DOCTYPE html>
<title>CSS zoom applies to border-width when specified and inherited</title>
<link rel="help" href="https://drafts.csswg.org/css-viewport/">
<link rel="match" href="border-width-ref.html">
<style>
.box {
width: 60px;
height: 60px;
border: 8px solid red;
margin: 10px;
display: inline-block;
}
.box-rem {
width: 60px;
height: 60px;
border: 0.5rem solid blue;
margin: 10px;
display: inline-block;
}
.zoom {
zoom: 2;
}
</style>
<div class="box">unzoomed px</div>
<div class="box-rem">unzoomed rem</div>
<div class="zoom">
<div class="box">zoomed px</div>
</div>
<div class="zoom box">zoomed inherited px</div>
<div class="zoom box-rem">zoomed inherited rem</div>