doc_markup_void_elements.html

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<!DOCTYPE html>

<html class="html">

  <head class="head">

    <meta charset=utf-8 />

    <style>

    .before:before {

      content: "before";

    </style>

  </head>

  <body class="body">

    <h1>Test void elements in HTML document</h1>

    <img>

    <hr>

    <hr class="before">

    <br>

  </body>

</html>