What are cons to using [deprecated elements](http://www.evotech.net/blog/2007/07/xhtml-deprecated-elements-and-attributes/) if I don't care about validation and I use that DTD which supports them? Will deprecated elements will not be rendered by future browsers?

Some online WYSIWYG editors (which we use in CMS) still give output in deprecated elements. Must I invest the time to change the output for a client?

[alt text http://easycaptures.com/fs/uploaded/241/3445655293.jpg](http://easycaptures.com/fs/uploaded/241/3445655293.jpg)

Should we avoid deprecated elements at any cost? 

Currently all mainstream browsers show all deprecated elements.

I just wanted to know the disadvantages of using deprecated elements to give to a non technical client even if all are working today in all browsers.

Update: 

> 
> you can meet guideline 1.3 ensure that
>  information and structure can be
>  separated from presentation by using
>  font and align elements if you like.
>  Yes, that’s right. You can use an
>  element which was deprecated in HTML
>  4.01 nine years ago that ties the presentation of your page is into the
>  page structure and content — there’s
>  no success criterion telling you not
>  to use deprecated features, and you
>  can still pass all of the success
>  criteria for the guideline which
>  states “ensure that information and
>  structure can be separated from
>  presentation.” And this is a step
>  forward?
> 
> 
> 

I found this in this article <http://accessites.org/site/2006/06/the-wcag-20-what-a-whopper/>