Istorja.ru W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “checkbox” role is unnecessary for element “input” whose type is “checkbox”.
The “main” role is unnecessary for element “main”.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “ipsLayout_sidebar” was here.
The value of attribute “href” on element “a” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
The value of attribute “title” on element “a” from namespace “http://www.w3.org/1999/xhtml” is not in Unicode Normalization Form C.
Text run is not in Unicode Normalization Form C.
Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “ipsLayout_sidebar”.
Element “h3” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
The “center” element is obsolete. Use CSS instead.
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