# textarea.html -rw-r--r-- 628 bytes View raw
                                                                                
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<!DOCTYPE html>
<!--
  Hack for displaying a vertical line at 80 characters in a textarea, like
  display-fill-column-indicator-mode in Emacs or colorcolumn in Vim.
-->
<html>
  <head>
    <style>
      .container {
        position: relative;

        font-family: monospace;
      }

      .container hr {
        position: absolute;
        top: 0;
        left: 80ch;

        width: 1px;
        height: 97%;

        border: none;
        background-color: #bfbfbf;
      }
    </style>
  </head>
  <body>
    <div class="container">
      <textarea rows="25" cols="100"></textarea>
      <hr>
    </div>
  </body>
</html>