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Limit the total local storage space at a browser level. E.g. 1GB. Just like you might limit the total size of temporary internet files/cache.

Beyond that, just provide a good (simple) UI for deleting stuff. Which could suggest candidates for deletion based on heuristics like you suggest. E.g. iframes shouldn't need so much. Hopefully less visited sites would be suggested for deletion too.

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> Limit the total local storage space at a browser level. E.g. 1GB

I wouldn't mind Google Maps to fill some 100 GiB with map data so that I can have detailed maps while I am offline in some remote African town.

You might like OpenStreetMap! You can get the whole planet in a <30GB package: http://planet.openstreetmap.org/planet/

Granted that is the raw data, but you can extract the regions you need easily and then render them on demand.

I don't think it's such a good idea to link directly to such huge files from here. The directory would do just fine http://planet.openstreetmap.org/planet/ and avoid bots or inattentive clicks.

But good to know anyway!

Good suggestion, I changed the link.

Then it should be a browser preference.

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