Allturtles.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.
The “center” element is obsolete. Use CSS instead.
Bad value “facebook” for attribute “rel” on element “a”: The string “facebook” is not a registered keyword.
Bad value “twitter” for attribute “rel” on element “a”: The string “twitter” is not a registered keyword.
Bad value “gpage” for attribute “rel” on element “a”: The string “gpage” is not a registered keyword.
Bad value “pinterest” for attribute “rel” on element “a”: The string “pinterest” is not a registered keyword.
Warnings:
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
Empty heading.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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