html5 - Limit of localstorage on iPhone? - Stack Overflow: "Mobile Safari on the iPhone and iPad will hold 5MB before throwing a QUOTA_EXCEEDED_ERR when using localStorage. If you're using HTML5 SQL, the user will be prompted at 5MB intervals to increase the storage limit.
Desktop Safari v4 does not have a limit, afaik, on localStorage. Safari v5, however, limits the site to 5MB before throwing a QUOTA_EXCEEDED_ERR, exhibiting the same behavior as the mobile version."
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