Congrats Bootstrap team for Bootstrap 4 alpha release great work. I am a Bootstrap loyalist from Bootstrap 1 release. I looked at Semantic-UI components for last days and agree they are good in looks but not so easy to use for responsive environment. But comes with lot of integrated feature such as Reveal, Sticky content, Calendar, Validation etc. Was hoping lot now with release 4, Feature displayed in official theme could have been part of release 4. please add those as part of release 4.