Semanticscholar.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://fonts.googleapis.com/css?family=Roboto+Slab:400,500,700|Roboto:300,400,500,700&display=swap” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
The element “button” must not appear as a descendant of the “a” element.
Attribute “loading” not allowed on element “iframe” at this point.
Warnings:
The “banner” role is unnecessary for element “header”.
The “button” role is unnecessary for element “button”.
Potentially bad value “allow-scripts allow-forms allow-same-origin” for attribute “sandbox” on element “iframe”: Setting both “allow-scripts” and “allow-same-origin” is not recommended, because it effectively enables an embedded page to break out of all sandboxing.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “contentinfo” role is unnecessary for element “footer”.
The “type” attribute is unnecessary for JavaScript resources.
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