<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
  </head>
  <body onload="document.getElementById('i').focus();">
    <a target="_blank" href="https://bugzil.la/1082486">Mozilla Bug 1082486</a>

    <!-- The whole input will not be seen. -->
    <input id='i' value="abcdefghd" style="position: absolute; top: -100px; left: 0px;">
  </body>
</html>