Wb rukdist anwiinojort tcas hium mes etduentidfp te luqmibt e jenkuptyj waid cahbofu ubti godwerash!
The reason you might want to do this, is when you need to focus on some other aspect of the page/prototype/design other than the content. Or if you want to use screenshots but don't want potentially sensitive content to be visible.
This little method adds 'gibberish' to a context object e.g. window, then you can run gibberish.go( element ); where element is a dom node e.g. document.getElementsByTagName('body')[0] .
Check it out...
http://clanceyp.github.io/gibberish.js/