Science-education.ru W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “div” not allowed as child of element “h1” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “navbar-collapse-1”.
Bad value “submit” for attribute “type” on element “a”: Subtype missing.
Element “div” not allowed as child of element “h2” in this context. (Suppressing further errors from this subtree.)
End tag “br”.
No “p” element in scope but a “p” end tag seen.
The “width” attribute on the “th” element is obsolete. Use CSS instead.
Stray end tag “a”.
A slash was not immediately followed by “>”.
End tag had attributes.
Stray end tag “a<”.
End tag “td” seen, but there were open elements.
Unclosed element “a”.
Element “div” not allowed as child of element “h3” in this context. (Suppressing further errors from this subtree.)
Bad value “mailto: support@rae.ru” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “navbar-collapse-1” was here.
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