In particular, lots of legacy JS bugs that we can't get rid of since people "rely" on them. Also, the biggest one that spurred me to launch this today is all th

In particular, lots of legacy JS bugs that we can't get rid of since people "rely" on them. Also, the biggest one that spurred me to launch this today is all the proprietary -webkit- CSS prefix stuff, especially the non-standard stuff everyone is relying upon in mobile!