Disclosure: I think I got misunderstood. This is not a serious library meant for multi-browser support or a general purpose library like jQuery (which I use daily). It's a toy project born out of interest, will to learn and the simple fact that in another project I have, Sight(https://github.com/tsenart/sight), I didn't use any external libraries (except Underscore.js). That's how I really started to learn Javascript. I missed the ability to directly iterate through the results of document.querySelectorAll() so I just had fun playing with a solution and ƒu.js came out. I'm not praising it as the best library in the world. And it can even have no advantages over the others. It's just my toy project with which I learned a lot (and even more with brutal criticism) and published for the others to see. Not selling anything here. (The headline of the page is mere satyre)