I researched and people all over the internet are using different breakpoints these days when working in ems. Seems like most are just using the frameworks (bootstrap, foundation) and their respective fluid grids instead. Now that most mobiles have a decent screen-size and resolution, I think I may not have to define my breakpoints at less than 40ems (640px).
Of course, breakpoints only need to be defined when the layout actually breaks but I need a base to work from.
Currently, my breakpoints are:
@media all and (min-width: 40em) /* 640px - for tablets*/
@media all and (min-width: 62.5em) /* 1000px - for desktops*/
I have seen some 25em breakpoints floating around on the web. Do I need the 25em breakpoint in a mobile-first design? Of course, it depends if you targeting a specific user-base but for a generic base, is it needed? Also what breakpoints do you generally find yourself defining?
For example, the author of this article also seems to be using 24em in a mobile first design.