What is the soft limit (at which the user needs to give permission to exceed)? What is the hard limit (maximum allowed).
Update May 2020: Chrome now lets an origin use 60% of the storage device's space (Real nitty gritty: "storage device" is the partition containing the chrome profile directory). Updated article here https://web.dev/storage-for-the-web/#how-much
The rule of thumb is 6% (edit 2015-Jul: was 10%) of the available space on the user's hard drive, less if your origin is using websql, appcache or the filesystem api. The MDN doc mentioning 5mb was outdated and has been updated. The gory details about the current policy are here: https://developer.chrome.com/apps/offline_storage
Note some annoying subtleties:
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