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How to fix that
element "SU:BADGE" undefined <su:badge layout="5"></su:badge>
I use HTML 4.01 Transitional on my website …
The BADGE is from stumbleupon.com website
Thank you . Regards.
Since such markup is not valid in HTML 4.01, the validator is just doing what you asked it to do: reporting any reportable markup errors.
The only practical reason why such error messages might be disturbing is that if there are many of them, you might accidentally miss to notice some other error messages, relating to constructs where your markup unintentionally deviates from HTML 4.01. If this is an issue, consider writing a custom DTD. It requires some understanding of SGML, but so does the use of validators in general, does it not?
On the other hand, you might decide to refrain from using tags suggested by people who cannot do such a simple thing using valid HTML. There are many ways to put information on a web page in a manner that does not affect the visible appearance but can be retrieved by programs that search for specific constructs (e.g.,
metatags). They decided on a way that causes problems to authors who wish to use validtors.