Chemwatch.net W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “a” in this context. (Suppressing further errors from this subtree.)
No “p” element in scope but a “p” end tag seen.
Bad value “tablet and phone mac800px” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “” for attribute “width” on element “img”: The empty string is not a valid non-negative integer.
Bad value “” for attribute “height” on element “img”: The empty string is not a valid non-negative integer.
End tag “div” seen, but there were open elements.
Unclosed element “main”.
Stray end tag “div”.
Stray end tag “main”.
Stray start tag “style”.
Cannot recover after last error. Any further errors will be ignored.
Warnings:
The “navigation” role is unnecessary for element “nav”.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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