3 ms·See http://www.libpng.org/pub/mng/ http://www.libpng.org/pub/mng/by eggspurt 14y agoSee http://www.libpng.org/pub/mng/ http://www.libpng.org/pub/mng/kbrosnan 14y agoWhich is unsupported in every major browser.eggspurt 14y agoFinally a feature browsers can compete on! :)