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<!DOCTYPE html>
<meta charset="utf-8">
<title>Fieldset anonymous content box inherits rule-overlap (reference)</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#anonymous-fieldset-content-box">
<style>
.container {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 20px;
column-rule: 20px solid green;
row-rule: 20px solid blue;
rule-overlap: column-over-row;
width: 200px;
margin: 0;
}
.item {
height: 50px;
background: silver;
}
</style>
<p>There should be a 2-column grid with green column rules overlapping blue row rules below.</p>
<div class="container">
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
</div>