Localstorage object is only available in HTML5. Main benefit of this object is that object persist the values whether you closed the browser.
Also we can say this is a cookie with no expiration date with more extra benefits and features. Here are simple syntax of localstorage (we are not covering sessionstorage).
localStorage.setItem("Author", "Gaurav Kumar Arora");
In above our storage key is ‘Author’ and subsequent value is ‘Gaurav Kumar Arora’
localStorage.Author= "Gaurav Kumar Arora";
There is one another way (as a C# coder, I like it ), we can add value of a key. Here we are adding ‘Author’ key’s value as ‘Gaurav Kumar Arora’.
Sometime we need to operations like removal of a specific key. Here, we are removing ‘Author’ key from our localstorage.
This is a very simple description of usage of localstorage. I am going to publish a full article on HTML5 (which will cover all the things) .