Depracated Tags Deprecated refers to those HTML tags and attributes that should be phased out in favor of style sheets.
Good pages to look up depracated tags

http://www.codehelp.co.uk/html/deprecated.html

and

http://www.w3.org/TR/html4/index/elements.html

Is it a good idea to avoid using deprecated tags?

Yes

If I use deprecated tags will my pages break?

No, not in today’s browsers but in the future.