No one is exempt from making mistakes and getting browser crashes. This can be really annoying, if you have worked hard for a long time filling in an extremely complicated form, looking for data in a big spreadsheet with complex filters or have just set a nice and convenient layout scheme to work on a web page — and everything is lost just because the page is reloaded or closed. It is a good idea to save and store temporary data to rescue your users from such a disappointing experience and help them not to lose their time doing everything all over again or readjusting their working space every time they open the same page.
If you create applications with forms, tables and complex layouts and want to help your end-users restore the data that haven’t been saved locally or sent to a server due to some accidents and mistakes (page reloads, browser crashes, laptop shutdowns, etc) or just want to let them preserve the state of an app for any other reason, I will show you how.