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Placeholder на странице xhtml не проходит валидацию в w3


Daiver
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Имеется xhtml страница с формой отправки сообщений. При проверке на валидацию w3 выдает ошибку в строке

<input name="title" class="comments-name b-comments__name-i" placeholder="Ваше имя" maxlength="100"/>

страница с ошибкой находится по адресу http://dorogadushi.narod.ru/uslugi/otzivi_i_predlozheniya/

Ругается валидатор именно на placeholder. Говорит, что там нельзя чтобы был такой.

привожу отчет валидатора w3:

there is no attribute "placeholder"

…ass="comments-name b-comments__name-i" placeholder="Ваше имя" maxlength="100"/>

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.

Помогите понять в чем проблема.

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Все верно, в XHTML нет такого атрибута, placeholder был введен в HTML5.

И чем тогда можно пользоваться в xhtml как альтернативой placeholder?

Или может через css его можно чем-то заменить?

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И чем тогда можно пользоваться в xhtml как альтернативой placeholder?

Или может через css его можно чем-то заменить?

Моё мнение - забить на валидатор или поставить доктайп html5.

http://css-live.ru/articles/glavnyj-sekret-html5.html

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