I disagree. The biggest change over the last 5 years has to be that we're designing web content for mobile devices in a very serious way. And that is due to m

I disagree. The biggest change over the last 5 years has to be that we're designing web content for mobile devices in a very serious way. And that is due to many of the 'moore's law' advances that have relatively little to do with javascript execution. (Small-screen quality, cpu/gpu/memory speed, improved communications chips and infrastructure, etc)