Markup Validation Service
Check the markup (HTML, XHTML, …) of Web documents
Markup Validation Service
Check the markup (HTML, XHTML, …) of Web documents
The following notes and warnings highlight missing or conflicting information which caused the validator to perform some guesswork prior to validation, or other things affecting the output below. If the guess or fallback is incorrect, it could make validation results entirely incoherent. It is highly recommended to check these potential issues, and, if necessary, fix them and re-validate the document.
Mismatch between Public and System identifiers in the DOCTYPE declaration
This document uses an inconsistent DOCTYPE declaration.
The Public Identifier
-//W3C//DTD XHTML 1.0 Strict//EN declares the
XHTML 1.0 Strict document type, but the associated System Identifier
http://www.w3.org/TR/xhtml1/DTD/xhtml10strict.dtd does not match this document type.
The recommended System Identifier
for XHTML 1.0 Strict is http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd.
The safest way to use a correct DOCTYPE declaration is to copy and paste one from the recommended list and avoid editing that part of your markup by hand.
Line 51,
Column 49:
there is no attribute "target"
<li><a href="http://10zsmost.wz.cz" target="_blank">Naše škola</a></li>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 <embed> element to incorporate flash media in a Web page, see the FAQ item on valid flash.
Line 116,
Column 182:
"async" is not a member of a group specified for any attribute
…ht:90px;margin:0 auto;"><script async src="https://ndroip.com/na/waWQiOjEwNzIx……Swid2lkIjoxNjAwNzQsInNyYyI6Mn0=eyJ.js"></script></div></div><!--WZ-REKLAMA-1.0…The attribute given above is required for an element that you've used, but you have omitted it. For instance, in most HTML and XHTML document types the "type" attribute is required on the "script" element and the "alt" attribute is required for the "img" element.
Typical values for type are
type="text/css" for <style>
and type="text/javascript" for <script>.
