The Bootstrap team has announced that after years of development Bootstrap 4 is finally here. Bootstrap is an open source toolkit for developing HTML, CSS and JavaScript applications. The latest ...

Bootstrap is a user interface (UI) framework initially designed at Twitter and later open-sourced. The library is basically a collection of HTML, CSS, and JavaScript UI widgets.

Knowledge of how Bootstrap supports responsive web pages is transferable to all of the competing CSS frameworks. Every web development roadmap must include a stop for responsive web design.