title: Animated transparent image noise in browser - Limbo Effect
body: <p>I'm trying to make animated image noise, similar to the game Limbo, or Left4Dead.</p>
  
  <p>The noise would have to have levels of transparency, which takes .gifs out of the options.</p>
  
  <p>I could make a div with a .png sprite sheet, and animate through that, then repeat this small div all over the site, but that sounds costly. </p>
  
  <p>.apng would be the best choice, but that really isn't supported. </p>
  
  <p>The only other option I can think of is generating the noise client side with javascript, but that sounds like it could cause huge browser fps drops. </p>
  
  <p>Any ideas stackoverflow? </p>