Hi When you zoom in to twitter website the icons on top navigation bar of twitter does not break pixels? I mean the icons does not go blur due to zooming in of the browser. There is "profile icon", "discover icon", "message-icon" and few others. What do they use to display those icons in such a way? Thanks
A quick look at the source would tell you how it's done - but short version: they're not images - they're a font. Have a look here: http://bradsknutson.com/blog/recreating-new-flat-twitter-navigation/
I knew that they are not images but couldn't tell what it really is. I used the inspector to find out what it is and in css it showed "content:SOME_GARBAGE". I've got my answer now, thanks.