March 2017
Intermediate to advanced
821 pages
18h 21m
English
The Bootstrap 4 source is written in Sass instead of Less. Less was used until Bootstrap 3. This is great because Sass tends to be more favorable by frontend developers. It also compiles faster. Also, it doesn't seem as if there are currently any plans for a Less version. You can find the source files at https://github.com/twbs/bootstrap/tree/v4-dev.
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