Warnings:
The “navigation” role is unnecessary for element “nav”.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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).
Errors:
End tag “h4” seen, but there were open elements.
Bad value “holder.js/90x90?bg=68217A&text=.NET Blog” for attribute “src” on element “img”: Illegal character in query: space is not allowed.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “holder.js/90x90?bg=68217A&text=Scott Hanselman” for attribute “src” on element “img”: Illegal character in query: space is not allowed.
Bad value “holder.js/90x90?bg=68217A&text=.NET Web Dev Blog” for attribute “src” on element “img”: Illegal character in query: space is not allowed.
Bad value “holder.js/70x70?bg=68217A&text=Aug \n 7” for attribute “src” on element “img”: Illegal character in query: space is not allowed.
A numeric character reference expanded to carriage return.
Bad value “holder.js/70x70?bg=68217A&text=Aug \n 8” for attribute “src” on element “img”: Illegal character in query: space is not allowed.
Bad value “holder.js/70x70?bg=68217A&text=Aug \n 9” for attribute “src” on element “img”: Illegal character in query: space is not allowed.
Bad value “holder.js/70x70?bg=68217A&text=Aug \n 11” for attribute “src” on element “img”: Illegal character in query: space is not allowed.
Bad value “holder.js/70x70?bg=68217A&text=Aug \n 13” for attribute “src” on element “img”: Illegal character in query: space is not allowed.
Bad value “https://vimeo.com\ndcconferences” for attribute “href” on element “a”: Backslash ("\") used as path segment delimiter.
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