Now this one is a little tricky if you are not experienced with programming. After all the earlier missions, you tend to look for the same code that you saw earlier and get obfuscated. But this one too is very simple.
Like earlier levels you will not find the exact source code in this one. The button tag you were looking earlier missions, is not present in this source code. Well guys, the button is just there, its just that you cannot see it.
To get the password for this mission, you can use developer tools and you will find the button tag.
Look at this, this is what you see, when you look at the same code through a developer tool.
Note: Different browsers will show button tag in different ways. But the password will always be there.
For those who are still looking for the password, its j00w1n.