Strongfirst.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include more than one “meta” element with its “name” attribute set to the value “description”.
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 “searchform”.
Duplicate ID “attendacourse”.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
Bad value “250px” for attribute “height” on element “iframe”: Expected a digit but saw “p” instead.
Attribute “type” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “searchform” was here.
The “main” role is unnecessary for element “main”.
The first occurrence of ID “attendacourse” was here.
The “contentinfo” role is unnecessary for element “footer”.
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