modify it as long as the entire work (including additions) remains under this license. See http://www.gnu.org/copyleft/fdl.html for details. It uses material from the Wikipedia article Framing !!!     Ott, Stephan, Linking - Der technische Hintergrund W3C pi’S kleine Linklehre Tour de Link 16.7.2000 Jenny Lyn Bader, Forget Footnotes: Hyperlink ,