How get the password behind asterisk (*******)

Hello Guys,
    Now I am Gonna Show You How to Get Password Behind the Asterisk, that is *******.(This is Mostly Work on Internet Explorer May be on Others Also)


So, Lets Start..... (This is Only for Educational Purpose)


1) Goto Any Login Page, (I have Choose Yahoo.com)


2)Now U have Enter User-Id and Password (If not already added)


As Following Image

 

Now You Have Password But you cant read..

So Follow the Important Step.. 

Erase Your Whole Address bar (i.e, http://.....)

And Enter Following Java Script Code.

javascript: alert(document.getElementById('Passwd').value);

Now Press ENTER..... or Click on Go...

You will Get Error.... But that error is Your Password... TADDAAAA

Like this.............