Unusual shape of a textarea?

Question

Usually textareas are rectangular or square, like this:

But I want a custom-shaped

Answer 1

Maybe it's possible with Content Editable ?

It's not a textarea, but if you succeed to create a div with this shape, it could work.

I think it's not possible with just textarea...

A little example: http://jsfiddle.net/qgfP6/5/