This includes such things as frames and Java applets. Tables are approaching usability, but for now public pages must not depend on the availability of tables. However, tables are acceptable for use on local pages. Features such as tables or frames can be used if the page still renders acceptably on a feature-ignorant browser. Don't use blinking text.
Many people find it extremely annoying.
Any remaining weblint warnings should be carefully evaluated. Pages containing nothing but headers and prose should be tested using at least one browser. Pages using lists or preformatted text should be tested using both Netscape and at least one other browser. Those pages failing to test will be brought to the owners attention. If the owner has the resources to test them themselves this is encouraged.