Curious detail: the button/widget icons of the browser chrome are composed of multi-layered box-shadows (i.e. one box-shadow definition per pixel or line, conca

Curious detail: the button/widget icons of the browser chrome are composed of multi-layered box-shadows (i.e. one box-shadow definition per pixel or line, concatenated to a sting) of a `:before` pseudo element. (I don't think that I've seen anything alike before.) Meaning: also no images.