Esp8266.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
The first occurrence of ID “mywidth” was here.
The “form” role is unnecessary for element “form”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “contentinfo” role is unnecessary for element “footer”.
Errors:
End tag “div” seen, but there were open elements.
Unclosed element “a”.
No “a” element in scope but a “a” end tag seen.
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 “span” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “mywidth”.
No “p” element in scope but a “p” end tag seen.
The “center” element is obsolete. Use CSS instead.
Attribute “displaytext” not allowed on element “span” at this point.
Stray start tag “img”.
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