[css-containment] For what problems is CSS Containment the best solution?

I was thinking about the best way to implement CSS rendering of large data
sets and wrote my thoughts down in blog (and demo) form:
http://robert.ocallahan.org/2014/02/implementing-virtual-widgets-on-web.html
In summary, for maximum scalability you want to dynamically create and
recycle DOM elements so that the size of your DOM is proportional to the
amount of visible data, not the amount of data available. This can be
implemented reasonably well on the Web platform, though there are a couple
of small API extensions that would make it work better. If you take this
approach, CSS Containment is not needed or even particularly helpful.

So, for what use-cases is CSS Containment a better solution than such
DOM-recycling techniques? I don't know.

Rob
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