Fix handling of btn-group placed inside input-group-btn (used for mixing dropdowns with normal buttons)
Downgrade Safari and OS X
Merge pull request #11916 from ZDroid/fix-iversions

Downgrade Safari and OS X
Merge pull request #11910 from InWayOpenSource/btn-group-inside-input-group-btn

Fix handling of .btn-group placed inside .input-group-btn
fix href of "Browser and device support"
Merge pull request #11923 from wangsai/fix-id

fix href of "Browser and device support"
fixes #11925: cover template for firefox
Merge branch 'master' of github.com:twbs/bootstrap
add inline note about navbar sizing
Fixes #11899: Ensure proper margins and .small/small usage for heading tags (e.g., .h1-.h6)
fix typo