Uh, ok. I give up. I just wasn't able earlier to find this paragraph from spec.
Sorry if I disturbed you too much :)


> Browsers should ignore things which they don't recognise:
> (from http://www.w3.org/TR/1999/REC-html401-19991224/html40.txt, paragraph
> 7.2)
>    Note. As of the 24 December version of HTML 4.01, the HTML Working
>    Group commits to the following policy:
>      * Any changes to future HTML 4 DTDs will not invalidate documents
>        that conform to the DTDs of the present specification. The HTML
>        Working Group reserves the right to correct known bugs.
>      * Software conforming to the DTDs of the present specification may
>        ignore features of future HTML 4 DTDs that it does not recognize.
> This was also the case with earlier versions of HTML.
> regards,
> Derick Rethans

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