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 “Cache-Control” for attribute “http-equiv” on element “meta”.
Bad value “Pragma” for attribute “http-equiv” on element “meta”.
Bad value “Expires” for attribute “http-equiv” on element “meta”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Duplicate attribute “role”.
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
Text not allowed in element “ul” in this context.
Duplicate ID “myModalLabel”.
Element “center” not allowed as child of element “h4” in this context. (Suppressing further errors from this subtree.)
The “center” element is obsolete. Use CSS instead.
No “p” element in scope but a “p” end tag seen.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “navigation” role is unnecessary for element “nav”.
The “form” role is unnecessary for element “form”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “myModalLabel” was here.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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