[VE][108] New Error Message Suggestion

Error message: #108

Current explanation:
You have used the attribute named above in your document, but the
document type you are using does not support that attribute for this
element. This error is often caused by incorrect use of the "Strict"
document type with a document that uses frames (e.g. you must use the
"Transitional" document type to get the "target" attribute), or by
using vendor proprietary extensions such as "marginheight" (this is
usually fixed by using CSS to achieve the desired effect instead).

Suggested addition:
This error may also result if the element itself is not supported in
the document type you are using, as an undefined element will have no
supported attributes; in this case, see the element-undefined error
message for further information.