Unvalidated HTML
HTML which has not been validated can cause problems.
In this example a quote (") is missing.
This error will not be detected by looking at the page, only by following all links or using a validator.
The talk on <EM>Providing Information on the Web</EM> will be given
at <A HREF="http://www.herts.ac.uk/Libtech/libtech.htm>LibTech 97</A>