a single web specification that browsers would be forced to adopt in order to prevent fragmentation. html and javascript may be different technologies, but as react has taught us, are of the same concern. so merging them closer together would be good (web components is a step in the right direction). throw in css in there too because it's currently a joke. it should have consistent behavior across varying divs, regardless of usage.

post script: javascript should be type safe and support interfaces/abstract classes.