When using a single page app, sending a link to a friend should get them where we were. More than that, a search engine spider should be able to index that same content.
When some content is requested, it indicates to the user that something is happening. You can also define different kinds of CSS animations to use during state transitions.
Once you load a certain surface this content can be cached in memory and be retrieved later on without any additional request.
Check out the examples below to see how Senna.js can speed up your static HTML site with few lines of code.