Minorplanetcenter.net W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://fonts.googleapis.com/css?family=Arvo:400,700,400italic,700italic|PT+Sans:400,700,400italic,700italic|PT+Sans+Narrow:400,700” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
End tag “section” seen, but there were open elements.
Unclosed element “article”.
Attribute “seamless” not allowed on element “iframe” at this point.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “center” element is obsolete. Use CSS instead.
Warnings:
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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