Non-standard tables flagging error

[bunnybooboo]

Further to #233 I've identified another rather ambiguous use case. This time seen in Tables.

Style Guides only discuss the use of Standard Tables. But there appears to be a very common use of non-standard tables, for example, seen here in HTML Element Reference. Every reference subpage you click on shows the use of non-standard table with the .properties class.

So this time I question: the community standard experienced in the documentation vs the CSS style guide (and subsequently this add-on)? Has there been a style recommendation change? Or could, perhaps, this often used non-standard table be considered for inclusion in the CSS style guide? Therefore avoiding an error flag.