When designers and html meet

Hi all,
I hope this isn't too much off topic, but this list has always been a good
source of information in the past.

I will be teaching an upcoming Basic HTML class to savvy graphic designers.
One of the subjects I want to include is "Don'ts When Designing for the
Web". i.e. print gradients vs. web gradients, image backgrounds in tables,
and remembering bandwidth. Are there any other examples anyone can suggest
or some good sources for examples of these types of don'ts?

Thank you for your help,
Caramel

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