Not just JS state, either. What if I have a flash movie running? When you middle-click a link on a YouTube video, the video keeps playing. You probably don't

Not just JS state, either. What if I have a flash movie running? When you middle-click a link on a YouTube video, the video keeps playing. You probably don't want pages in your history to be downloading data, playing video, etc. Ideally, you'd probably want it to start playing right where you left it when you click back. What about if the thing in my history is a 1gb video file, and I type "gmail.com" in the address bar. I have Firefox set to remember my state between sessions, and I rarely close my gmail tab. So, that video file might stay in my back-button history for months. Is it reasonable to expect it to freeze the video player's state and keep hold of that forever, every time the browser starts up? That'd probably suck. So, the author's suggestion isn't quite perfect. It's close, but misses some important edge cases, and misses the point of why this is very hard to do right.