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That shift happened in bootstrap 4, bootstrap 3 was <div class="..."> everywhere. Also 3 was when bootstap was really big. Good to see they improved, i guess :

• WorldMaker 7y ago
  That shift happened in Bootstrap 3's lifetime. The 3.4.1 navbar markup [1] and 3.3.7 navbar markup [2] is very similar to 4.x, but most of the semantic stuff and ARIA stuff is missing in 2.3.2 [3]. (I probably paid a lot more attention in 3.x documentation than most because of the mistake in a past life of forking Bootstrap 3 for an enterprise project and trying to keep it in sync with upstream. Never again would I consider doing that.) [1] https://getbootstrap.com/docs/3.4/components/#navbar https://getbootstrap.com/docs/3.4/components/#navbar [2] https://getbootstrap.com/docs/3.3/components/#navbar https://getbootstrap.com/docs/3.3/components/#navbar [3] https://getbootstrap.com/2.3.2/components.html#navbar https://getbootstrap.com/2.3.2/components.html#navbar