Headroom.js is a lightweight, high-performance JS widget (with no dependencies!) that allows you to react to the user's scroll.

Vex is a modern dialog library which is highly configurable, easily stylable, and gets out of the way. You'll love vex because it's tiny (6kb minified), has a clear and simple API, works on mobile devices, and can be customized to match your style in seconds.

A Dark Pattern is a type of user interface that has been carefully crafted to trick users into doing things, such as buying insurance with their purchase or signing up for recurring bills.

Yet (E)Another Tab Interface Implementation