px is not affected by a user's default zoom setting. em/rem with a root percentage value is.
Users can always zoom per site, but that's annoying for a user who has a preference, or has a disability and requires a larger font, to have to change it on every site individually.
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px
It's already scaled by browsers when you zoom anyway, and it works in all the old MSIE versions, so why not?
px is not affected by a user's default zoom setting. em/rem with a root percentage value is.
Users can always zoom per site, but that's annoying for a user who has a preference, or has a disability and requires a larger font, to have to change it on every site individually.