Mnd.cz W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
A document must not include more than one “meta” element with a “charset” attribute.
Duplicate ID “s_query”.
Duplicate ID “s_submit”.
Element “option” without attribute “label” must not be empty.
Element “img” is missing required attribute “src”.
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
Text run is not in Unicode Normalization Form C.
The first occurrence of ID “s_query” was here.
The first occurrence of ID “s_submit” was here.
This document appears to be written in Czech. Consider adding “lang="cs"” (or variant) to the “html” start tag.
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