I don't really see this as a Web competitor; all you need is for someone to throw together a dreamup.js and then it should work in every modern browser. No need

I don't really see this as a Web competitor; all you need is for someone to throw together a dreamup.js and then it should work in every modern browser. No need for a proprietary application. Secondly, the Achilles' heel of instructions.txt is that a lot of things in web dev are just impossible for describe. Bootstrap and friends go a long way towards given us some sort of standardized terminology to describe common components, but not every site uses them. A lot of sites build their own. At that point the usefulness drops, because instead of saying things like "give them a little space" you have to say things like "give it a margin of 2px on the top, -5px on the left, a solid #f5f5f5 border on the left, a border radius of 20%...." That being said, this is a good idea. The vast, vast majority of websites do not need to wade outside of what is "normal." Everyone would benefit from having a more accessible alternative to HTML & CSS, given that the current alternatives look like Twitter and Facebook.