Ndss.org 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 “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “menu-main” was here.
The first occurrence of ID “fullwidth” was here.
The “contentinfo” role is unnecessary for element “footer”.
Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “menu-main”.
Duplicate ID “fullwidth”.
Stray end tag “div”.
Text not allowed in element “iframe” in this context.
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