This is an old revision of the document!
.g-*, .gx-* and .gy-* (inclduing .g-0).mn-*…-left and …-right are renamed to '…-start and …-end (to cope with RTL languages)
== Other useful things to know ==
* role="button" to change cursor into pointer for an element (not needed for <button>)
* responsive images: .img-fluid
* 1px border around images: .img-thumbnail''