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Test Info:

<!DOCTYPE html>
<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="outline-offset: inset keeps the outline produced by outline-style: auto fully within the border box, so it can be completely hidden by an opaque overlay the same size as the box">
<style>
.wrapper {
position: relative;
width: 100px;
height: 100px;
}
.box {
position: absolute;
inset: 0;
background: green;
outline-style: auto;
outline-offset: inset;
}
.cover {
position: absolute;
inset: 0;
background: green;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="wrapper">
<div class="box"></div>
<div class="cover"></div>
</div>