Formula76.ru W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “type” attribute is unnecessary for JavaScript resources.
The first occurrence of ID “set” was here.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
Empty heading.
Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.
Errors:
Bad start tag in “img” in “head”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Stray end tag “noscript”.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
Bad value “tabpanel” for attribute “role” on element “form”.
Duplicate ID “set”.
Element “dl” is missing a required child element.
End tag for “body” seen, but there were unclosed elements.
Unclosed element “div”.
The “aria-controls” attribute must point to an element in the same document.
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