title: Detect Windows XP for Font Rendering
body: <p>I've been playing with Typekit for a year now and I've only just noticed how bad fonts look in Windows XP, even when using Chrome. Fonts look ok (not great) on Vista onwards.</p>
  
  <p>Is there a way to detect whether a user is on Windows XP?</p>
  
  <p>I've read a few articles about the different rendering engines on Windows e.g. <a href="http://blog.typekit.com/2010/10/21/type-rendering-web-browsers/" rel="nofollow">http://blog.typekit.com/2010/10/21/type-rendering-web-browsers/</a>
  http://blog.typekit.com/2010/10/15/type-rendering-operating-systems/#gdi-standard</p>
  
  <p>The reality is that sites still look horrendous with XP and Typekit, even when I have enabled 'cleartype' via display properties.</p>
  
  <p>In conclusion I simply would like to turn off Typekit fonts for XP users, they are un-readable. Normally I would go down the road of feature detection via Modernizr, but I can't detect the font rendering engine so I'm looking for other resorts. Is it possible to detect the operating system?</p>