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HTML5's localStorage databases are usually size-limited — standard sizes are 5 or 10 MB per domain. Can these limits be circumvented by subdomains (e.g. example.com, hack1.example.com and hack2.example.com all have their own 5 MB databases)? And is there anything in the standard that specifies whether parent domains can access their children's databases? I can't find anything, and I can see arguments for doing it either way, but it seems like there has to be some standard model.
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Way to Solution That's because localstorage doesn't support sharing the storage across subdomains or even domain. Thus, if you have something stored at a.example.com it won't be accessible from example.com or b.example.com.
SessionStorage is used for storing data on the client side. Maximum limit of data saving in SessionStorage is about 5 MB. Data in the SessionStorage exist till the current tab is open if we close the current tab then our data will also erase automatically from the SessionStorage.
The only limits on the size of the IndexedDB database will be the user's disk space and operating system. The localStorage quota is 5000KB, and there is no way for a web site to ask the browser for permission to store more than that amount in localStorage.
From http://dev.w3.org/html5/webstorage/#disk-space
A mostly arbitrary limit of five megabytes per origin is recommended. Implementation feedback is welcome and will be used to update this suggestion in the future.
It also mentions that :
User agents should guard against sites storing data under the origins other affiliated sites, e.g. storing up to the limit in a1.example.com, a2.example.com, a3.example.com, etc, circumventing the main example.com storage limit.
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