HTML 5 local storage - Javascript

gistfile1.js

//  First, make sure our browser supports HTML 5 local storage
if (typeof(localStorage) == 'undefined' ) 
{
    alert('Your browser does not support HTML5 localStorage. Try upgrading.');
}
else 
{
    try 
    {
        //  saves to the database using key/value
        localStorage.setItem('name', 'Hello World!'); 
    } 
    catch (e) 
    {
        if (e == QUOTA_EXCEEDED_ERR)
        {
            //  data wasn’t successfully saved due to quota exceed so throw an error
            alert('Quota exceeded!'); 
        }
    }

    //  Write out the item from local storage:
    document.write(localStorage.getItem('name')); 

    //deletes the matching item from the database
    localStorage.removeItem('name'); 
}