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I changed the accessibility level in HTMLTidy’s options, and now I’m getting an “access warning”, which says
Access: [6.1.1.1]: style sheets require testing (link) (Priority 1)
The “solution” is remarkably unhelpful:
How to clean this up, the right way (not by toggling a setting or turning off an option)?
There is no way to clean it up, because the warning refers to an issue that cannot be tested automatically (at the present state of the art, if ever). The warning is issued by Tidy whenever the page uses style sheets. It is a very general reminder indeed.
The message is basically this: turn off style sheets, and check that the page still works. On Firefox, you can easily switch off style sheets (via the View menu; using Web Developer Extension, you can also switch off individual style sheets).
Note that Tidy’s reference to “WAI 1.0” (i.e., WCAG 1.0) is outdated; WCAG 1.0 was succeeded by WCAG 2.0 in 2008, and the HTML Techniques document has been superseded by Techniques for WCAG 2.0. WCAG 2.0 is very different from WCAG 1.0.