Errors:
Internal encoding declaration “windows-1252” disagrees with the actual encoding of the document (“utf-8”).
Attribute “alt” not allowed on element “link” at this point.
A “link” element must not appear as a descendant of a “body” element unless the “link” element has an “itemprop” attribute or has a “rel” attribute whose value contains “dns-prefetch”, “pingback”, “preconnect”, “prefetch”, “preload”, “prerender”, or “stylesheet”.
Element “gcse:search” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
End tag “section” seen, but there were open elements.
Unclosed element “div”.
Stray end tag “a”.
Element “p” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
End tag “article” seen, but there were open elements.
Duplicate ID “blog-post”.
End tag “div” seen, but there were open elements.
Unclosed element “section”.
The “align” attribute on the “p” element is obsolete. Use CSS instead.
Bad value “images/demo/slider/computer-science -informatics.jpg” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Attribute “xmlns:dct” not allowed here.
Attribute “xmlns:cc” not allowed here.
Bad value “dct:source” for attribute “rel” on element “a”: The string “dct:source” is not a registered keyword.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “banner” role is unnecessary for element “header”.
Element name “gcse:search” cannot be represented as XML 1.0.
The “navigation” role is unnecessary for element “nav”.
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).
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The first occurrence of ID “blog-post” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “contentinfo” role is unnecessary for element “footer”.
Attribute with the local name “xmlns:dct” is not serializable as XML 1.0.
Attribute with the local name “xmlns:cc” is not serializable as XML 1.0.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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