- Check browser compatibility http://browsershots.org/
- Balises in the ‘head’ of HTML code don’t close; this makes as consequence invalid HTML pages.
- </a> markups in scripts must be splitted in order not to be recognized as closing markups. The page http://www.htmlhelp.com/tools/validator/problems.html advises to put a space; the presented code does not work here.
- Accessible Web design: http://www.syntacticweb.co.uk/calib.htm