Write anything on the browser client area with the JAVASCRIPT

javascript: contentBodyEditable="true".DesginMode="Born To Hack"

you can make use of HTML formatting tags like :-
<i>,<b>,<u>,<big>,<small>,<sub>,<sup>

eg:- 
javascript: contentBodyEditable="true".DesginMode="<i><b>Born 
<sub>To</sub> <sup> Hack 
</sup>"

output :-

....>>>In place of " Born To Hack " you can write anything .

it will be displayed on the client area of the browser

eg :- Your Name or anything 

javascript: contentBodyEditable="true".DesginMode="Your NAme"