details-after.html

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<!DOCTYPE html>

<!-- Any copyright is dedicated to the Public Domain.

   - http://creativecommons.org/publicdomain/zero/1.0/ -->

<head>

  <style>

    summary {

      list-style-type: none;

    details::after {

      content: "This is the details.";

      /* Match the margins and display of <p> */

      display: block;

      margin-block-start: 1em;

      margin-block-end: 1em;

  </style>

</head>

<html>

  <body>

    <details>

      <summary>Summary</summary>

    </details>

  </body>

</html>