Does LESS have an “extend” feature?
Yes, Less.js introduced extend in v1.4.0. :extend() Rather than implementing the at-rule (@extend) syntax used by SASS and Stylus, LESS implemented the pseudo-class syntax, which gives LESS’s implementation the flexibility to be applied either directly to a selector itself, or inside a statement. So both of these will work: .sidenav:extend(.nav) {…} or .sidenav { &:extend(.nav); … Read more