Answer 1

See here: http://www.w3schools.com/html/html5_webstorage.asp

The web storage is html5 techology and it is provided by the browser. But some might not provide it. "localStorage" and "sessionStorage" are the objects you can reach from JavaScript.

But there are more advanced storage tools in html5, but not supported widely. See here: https://www.html5rocks.com/it/features/storage