If I want to customise the breakpoints using `em`, I get compatibility errors.
It is good practice to set breakpoints in `em` instead of `px` when users use browser scaling.
See https://zellwk.com/blog/media-query-units/#concluding-the-experiments for more information why someone would like to do this. Only Safari users can get annoyed: https://adamwathan.me/dont-use-em-for-media-queries/
In any case, using a unitless number at line 42 would be very convenient.
projects / thirdparty / bootstrap.git / commit
