[Idea] [HTML] Disable window.history

It is currently possible to execute the `window.history` functions (`back()` and `forward()`)...

This isn't really a cause for concern, but, honestly, what use is there to have `window.history` in the webpage environment?

I see a lot of potentially annoying programs being created, albeit it'd be hard to save them after writing them...

Not exactly an issue, nor is this anything that needs to be dealt with right away (or ever, really), but something worth mentioning...

Start by examining the webpage environment entry point and how it exposes window.history, including the back() and forward() functions. First determine whether disabling those functions is wanted and what behavior should replace them; the issue is complete only when that scope and expected behavior are clearly decided.

Written by the indexing model from the issue text.