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As of (which will probably roll out with tomorrow's Canary), the `seamless` attribute of IFrame elements[1] will be hidden behind the "Experimental WebKit Features" flag. The feature's getting closer and closer to being "done" enough to push to the stable channel, but there are still a few fiddly issues that we'd like to hammer out before shipping it: follow along at

Even if you're not interested in `seamless`, please do feel encouraged to hop into `about:flags` and enable that flag. If you're a developer, you'll get a glimpse of the future: it enables some upcoming (experimental) WebKit goodness like scoped stylesheets, CSS exclusions and regions, CSP 1.1, and the Dialog element. These are fun things we'd love for you to be playing with, and filing bugs against. The more of a workout they get, the faster we can get them cleaned up and pushed to stable.

Fred Gandt's profile photoDinsan Francis's profile photoMichael[tm] Smith's profile photoKinuko Yasuda's profile photo
According to the dialog element "...has been dropped from the HTML5 specification."
I know I should (and may still) do my own homework, but does that mean the webkit support will be nothing more (at least for a long long time)?
This was the first I'd heard of it, and it's already dead :-(
The web moves very fast these days.
Ahh cool. Thanks for clarification.
Sorry for not having anything intelligent to say about it. I just watched "Immutability Changes Everything" by Pat Helland and my brain melted. He talks real fast.
I'll check out dialogs tomorrow. Need to sleep soon.
Thanks again.
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