Respekt.cz W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Duplicate ID “200130207”.
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
Element “img” is missing required attribute “src”.
Duplicate ID “200129995”.
Duplicate ID “200130495”.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Warnings:
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “200130207” was here.
The first occurrence of ID “200129995” was here.
The first occurrence of ID “200130495” was here.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in Czech. Consider adding “lang="cs"” (or variant) to the “html” start tag.
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