I remember reading a 5MB limit some place (ages ago) and I'm not able to find the reference at the time.

My team has been assuming that is true (for local,session)Storage and so far haven't been bitten.

Only occasionally have we even gotten close to that size. You can also shove loads of data in the DOM.

Edit: one of the old refs - 10MB

https://www.html5rocks.com/en/tutorials/offline/quota-resear...