How to draft text, client side programming

See more:

Javascript

client-side

Hi everybody
I save the text of the description.txt into document.cookie
I want to save the user's text as a draft.
The problems are:

When the user closes the browser, the cookie is deleted
If the enter is in the text, the enter is not saved in the cookie


Do you have a better solution to my problem?

What I have tried:

My code save text in the cookie

function draft() {
            document.cookie = document.getElementById("
            <%=Description_txt.ClientID%>").value;
            return false();
        }