What is sessionStorage in HTML5?

The sessionStorage is HTML5 features and used to store data in the client browsers but store data for one session. If browser is closed that time data is lost.

window.sessionStorage

myStore['sessionStorage'] = function(key, val) {

  try {

        sessionStorage.setItem(key, val);

        sessionStorage.removeItem(key);

        return true;

    }

    catch(e) {

       return false;

    }

};