Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “banner” role is unnecessary for element “header”.
Empty heading.
Potentially bad value “allow-scripts allow-same-origin allow-presentation allow-popups allow-forms” 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.
Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
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 “slider-button” for attribute “rel” on element “a”: The string “slider-button” is not a registered keyword.
Element “h3” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Stray end tag “span”.
End tag “h1” seen, but there were open elements.
Unclosed element “span”.
Attribute “alt” not allowed on element “a” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
End tag “div” seen, but there were open elements.
Unclosed element “a”.
End tag “h4” seen, but there were open elements.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “href” not allowed on element “div” at this point.
Stray end tag “i”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Bad value “contentinfo” for attribute “role” on element “section”.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Stray end tag “script”.
The “itemprop” attribute was specified, but the element is not a property of any item.
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