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Before reporting that "Property font-size-adjust doesn't exist :none", the validator reports that the value I gave it was an "invalid number." In CSS 2.0, "none" is a valid value, the property does not accept only "<number>". In CSS 2.1, however, the property does not exist at all, and it does report this. However, the two error messages are smashed together as one in the report.
The latest version of the validator will now output an error stating that a property does not exist in the checked profile, but does exist in others.