Protenders.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Start tag seen without seeing a doctype first. Expected “<!DOCTYPE html>”.
The text content of element “script” was not in the required format: Expected space, tab, newline, or slash but found “<” instead.
Bad value “” for attribute “id” on element “body”: An ID must not be the empty string.
End tag “symbol” did not match the name of the current open element (“path”).
Stray end tag “input”.
Element “img” is missing required attribute “src”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “img” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Stray start tag “script”.
Cannot recover after last error. Any further errors will be ignored.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “navigation” role is unnecessary for element “nav”.
Empty heading.
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