Marcguberti.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.
Duplicate attribute “style”.
Attribute “1” not allowed on element “iframe” at this point.
Attribute “2” not allowed on element “iframe” at this point.
Attribute “3” not allowed on element “iframe” at this point.
Attribute “4” not allowed on element “iframe” at this point.
Attribute “placement” not allowed on element “iframe” at this point.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
Attribute “1” is not serializable as XML 1.0.
Attribute “2” is not serializable as XML 1.0.
Attribute “3” is not serializable as XML 1.0.
Attribute “4” is not serializable as XML 1.0.
Empty heading.
The “complementary” role is unnecessary for element “aside”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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