bootstrap 4.0 versions (2014-10-29) ¶ https://github.com/twbs/bootstrap/releases/ https://en.wikipedia.org/wiki/Bootstrap_(front-end_framework )#Bootstrap_4 https://getbootstrap.com/ http://bootstrap4.guide/ Mark Otto announced Bootstrap 4 on October 29, 2014. bootstrap 4.3.1 (2019-02-13) bootstrap 4.3.1 (2019-02-11) bootstrap 4.1.3 (2018-07-24)