True, support still isn't perfect. The calendar/date picker stuff is especially annoying here, since it really should be easier to customise and more similar cr

True, support still isn't perfect. The calendar/date picker stuff is especially annoying here, since it really should be easier to customise and more similar cross browser than it currently is. But most of the things mentioned do work in more browsers than not, and you can use them without worrying the site will break in almost all cases. The new semantic elements will never have issues (unless you're trying to target IE8 or below), the validation works fine in pretty much all modern browsers (as do simple styles for it) and support for the picture element and srcset are pretty good too. The likelihood of anyone using the Blackberry browser or IE mobile is small enough to ignore.