I would love for some simple HTML(5?) API where certain anchor elements automatically show up on the scroll bar. That way, for instance, you could have a huge d

I would love for some simple HTML(5?) API where certain anchor elements automatically show up on the scroll bar. That way, for instance, you could have a huge document split into chapters visible from the scroll bar, or a blog post where you can just glance at the scroll bar to see how long the article is and how many comments there are. Something like `<a rel="scroll">`