Users overwhelmingly prefer sites which employ common
Web conventions (Nielsen, 1997). However, common standards are
very rare in web design. Some of the few that exist are:
Follow the standard hyperlink colors: blue for non-visited hyperlinks,
purple for visited hyperlinks, and red for active hyperlinks (but
if you have a site with a blue background -or any dark color- please
choose a color that can clearly be contrasted from the background
color. That is, if the choice is to either violate the standard or
not be visible, choose visibility!).
Place a navigational link to the homepage at the
upper left corner and bottom of each page.
Place the site's internal hyperlinks at the bottom
of each page (in addition to other places).
Images and text space should not cause horizontal
scrolling on lower resolution screens.
At the bottom of each page, place the date that
the page was updated and the URL address.
The text should facilitate the scanning of information.
Use ALT-Tags for graphics, especially for graphics
that serve as hyperlinks.
For an excellent and more detailed discussion of general
Web conventions, see the Yale Style Manual website: http://info.med.yale.edu/caim/manual/contents.html
Other fine guidelines include: