[whatwg] Provide a system to observe nodes entering and leaving the viewport

[Simon Pieters]

On 6/23/13 3:37 PM, louis-rémi Babé wrote:
> Hi, I've opened a bug about a ViewportObserver API that would allow
> developers to receive a digest of what nodes enter or leave the viewport
> (similar to MutationObserver).
> The bug is on the w3's bugzilla:
> https://www.w3.org/Bugs/Public/show_bug.cgi?id=20246
I will get to addressing this bug in due course.
> The discussion didn't go really far, it stopped a year ago but I've seen
> similar ideas pop up in different places(e.g.
> http://lists.w3.org/Archives/Public/public-web-perf/2013May/0027.html ).
> I'm now searching for people who could help me move this idea forward.
> Who should I ping/contact/harass?
What would be useful for me:

* use cases for the feature.
* URLs to existing pages that work around the lack of this feature.
* stated implementation interest from browser vendors.

Please comment further in the bug. Thanks!

-- 
Simon Pieters
Opera Software