I am creating an app using the Bespin editor and HTML5\'s localStorage. It stores all files locally and helps with grammar, uses JSLint and some other parsers for CSS and HT
To add to the browser test results:
Firefox i=22.
Safari Version 5.0.4 on my Mac didn't hang. Error as Chrome. i=21.
Opera Tells the user that the website wants to store data but doesn't have enough space. The user can reject the request, up the limit to the amount required or to several other limits, or set it to unlimited. Go to opera:webstorage to say whether this message appears or not. i=20. Error thrown is same as Chrome.
IE9 standards mode Error as Chrome. i=22.
IE9 in IE8 standards mode Console message "Error: Not enough storage is available to complete this operation". i=22
IE9 in older modes object error. i=22.
IE8 Don't have a copy to test, but local storage is supported (http://stackoverflow.com/questions/3452816/does-ie8-support-out-of-the-box-in-localstorage)
IE7 and below Doesn't support local storage.