W3C驗證錯誤：沒有屬性「佔位」

我收到來自W3C驗證以下錯誤：W3C驗證錯誤：沒有屬性「佔位」

Line 326, Column 63: there is no attribute placeholder
… type="text" name="pc" id="postcodefield" placeholder="Vul hier uw Postcode" /> 
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 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 element to incorporate flash media in a Web page, see the FAQ item on valid flash.

請查看源代碼：

<form method="get" action=""> 
    <input type="text" name="pc" id="postcodefield" placeholder="Vul hier uw Postcode" /> 
    <input type="submit" class="search_button" value="Zoeken" id="searchbutton" /> 
</form>

請幫我解決這個。

來源

2013-05-03 Pinky

使用HTML5文檔類型並確保驗證器驗證您的標記爲HTML5。 – 2013-05-03 09:31:19

我相信那是因爲你的DOCTYPE。您目前正在使用HTML5標記，因此您需要：

<!DOCTYPE html>

來源

2013-05-03 09:33:46 Eli

W3C驗證錯誤：沒有屬性「佔位」

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