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W3Cからのメッセージ

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W3Cの検証サービスで検証をしていて ようなメッセージが出ていた場合

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).
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 XHTMLis 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.

[解決方法]

DOCTYPE宣言を、確認してみてください。
HTML?XHTML?Transitional?Frameset?などを確認してみてください。
または
非推奨のタグは使ってないか、確認してください。
または
スタイルシートに、書き直せる要素などは、スタイルシートを使ってみてください。

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