I saw on a brazilian site how to make a ‘mobile menu’ without plugins.. besides the HTML code was wrong (menu tag to navigation), the same used jquery. The other thing is the method of animation, does not forcing hardware.
So, I take the challenge to make the same menu without javascript. Only with CSS. 🙂

Obviously, don’t work on ancient IE 😛 but you can always make a javascript to make the selector “:target” work in IE 😡

See the Pen mobile-like aside menu pure css by Felipe Nunes (@willpower) on CodePen.0