<!doctype html>
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="help" title="https://github.com/whatwg/html/pull/3686">
<link rel="help" title="https://html.spec.whatwg.org/multipage/#the-details-element">
<link rel="mismatch" href="single-summary.html">
<title>CSS Test: details ::before pseudo-element</title>
<style>
  details::before { content: "::before" }
</style>
<details>
  <summary>This is the main summary</summary>
</details>