Trickyenough.com 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.
Bad value “main-content-section clearfix” for attribute “id” on element “div”: An ID must not contain whitespace.
End tag “div” seen, but there were open elements.
Unclosed element “form”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “designer” for attribute “rel” on element “a”: The string “designer” is not a registered keyword.
Element “script” must not have attribute “async” unless attribute “src” is also specified.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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