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<!DOCTYPE html>
<meta charset="utf-8">
<title>Fieldset anonymous content box inherits column-rule (reference)</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#anonymous-fieldset-content-box">
<style>
.container {
column-count: 3;
column-gap: 20px;
column-rule: 5px solid green;
width: 300px;
margin: 0;
}
.item {
height: 200px;
background: blue;
}
</style>
<p>There should be a 3-column layout with green rules between columns below.</p>
<div class="container">
<div class="item"></div>
</div>