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”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The element “button” must not appear as a descendant of the “a” element.
The “center” element is obsolete. Use CSS instead.
End tag “br”.
End tag “div” seen, but there were open elements.
Unclosed element “center”.
Unclosed element “h1”.
Stray end tag “h1”.
No “li” element in scope but a “li” end tag seen.
Unclosed element “article”.
Attribute “width” not allowed on element “div” at this point.
Stray end tag “a”.
Unclosed element “main”.
Stray end tag “article”.
Stray end tag “main”.
Stray end tag “div”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Bad value “tel:+1 (303) 771-2552” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
Empty heading.
The “contentinfo” role is unnecessary for element “footer”.
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).
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