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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
5a8
to achieve the desired effect instead).
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.
How to fix: check the spelling and case of the element and attribute,
(Remember XHTML is all lower-case) and/or
check that they are both allowed in the chosen document type, and/or
use CSS instead of this attribute. If you received this error when using the
<embed> element to incorporate flash media in a Web page, see the
FAQ item on valid flash.
