Poppins is right.
This is one feature that I do miss from Windoze.
Not that I use it very often, but every now and then it is useful to print something off a website, such as directions or instructions instead of fumbling all over the file in a text editor.
I've submitted a request via
http://www.apple.com/macosx/feedback/
And suggest others who would like this feature implemented do the same.
This was a feature of the print menu (in Windoze), not of any particular application. The print menu had a toggle "Print selection" that knew what was selected in a document and would print only that.