style content within an iframe

Question

I have to style something within an iframe.

Answer 1

There is a new HTML 5 feature called seamless iframe, which perhaps does what you want:

[...] it indicates that the iframe element's browsing context is to be rendered in a manner that makes it appear to be part of the containing document [...]

However, for now it has very poor browser support (Webkit only I think). So it's not a good solution for most use cases today. But perhaps it is for you or some readers of the future.

Update: Browser support seems to be even worse today, so this isn't a solution today or in the near future.