[ris]

  <div style="font-family: Custom non-printing font 101">
    <input type="text" name="address"/>
    <input type="text" name="ssn"/>
  </div>

[matthberg]

Adobe made a font like this, adobe blank: https://github.com/adobe-fonts/adobe-blank

[teddyh]

http://www.catb.org/jargon/html/F/Flyspeck-3.html