title: Convert letter-tracking value set in Photoshop to equivalent letter-spacing in CSS
body: <p>I am currently building a site from a PSD. Most of the fonts have a letter-tracking of -25 ( <code>&lt;- AV-&gt;</code> : I'm guessing that is the symbol for letter spacing?).</p>
  
  <p>How would I get the same effect in CSS? I know the property is <code>letter-spacing: X</code> but it doesn't take percentages and -25px or pts would be a huge figure!</p>