A drawback is that the content isn't directly crawlable by search engines. I made an app earlier that uses Javascript to make static sites dynamic using Javasc

A drawback is that the content isn't directly crawlable by search engines. I made an app earlier that uses Javascript to make static sites dynamic using Javascript, but got lots of comments saying that it's anti-seo: http://news.ycombinator.com/item?id=2830429 http://news.ycombinator.com/item?id=2830429 Hence I offered a secondary PHP option.