It would be so great if there were more built-in interactive elements like tabs, modals, and tooltips. How many times have these incredibly basic things been re-created?
Yeah, all this time browser vendors should have been taking a "pave the cowpaths" approach to natively implementing stuff that everyone ends up reimplementing in CSS and JS. And HTML5 did a little of this, with e.g. date and color input fields. But they could have gone farther.
To disagree with my own point a bit, it’s unfortunate that the controls HTML5 added look different in every browser, and can’t be styled with CSS at all.
