tl;dr is that `with` is a long deprecated statement that is good for casual "golfing" and raising eyebrows of JS-savvy folks. Does not work in the "use strict" mode (so in modules) and generally should not be used in any "real-world" production code, since it prevents many optimisations and could possibly make the code harder to grasp. But I guess for casual one-time console doodles it could be fine. Reportedly it is supported in all major JS engines, and I don't think it will be really removed in foreseeable future.
