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There are a number of generic attributes in HTML 4.0 that can be applied to most HTML elements. I haven't listed these previously, unless they were critical or important to the function of the element. These include core, language, and event attributes. For listings and descriptions of these attributes, see www.w3.org/TR/html4/sgml/dtd.html#coreattrs.
For fuller descriptions of event attributes that can be used in conjunction with JavaScript scripts to specify behaviors triggered by user actions or system events, see www.w3.org/TR/html4/interact/scripts.html#h-18.2.3.