IMO, it depends on the nature of application that you are building. If it's going to be used by an audience that includes people stuck with ancient browsers, th

IMO, it depends on the nature of application that you are building. If it's going to be used by an audience that includes people stuck with ancient browsers, then ignoring that 2% could be a loss. But in most general cases, it's obviously better to cater to those ~17% people with reading disabilities (I read this figure somewhere).