Sdsc.edu W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “heading” for attribute “role” on element “header”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “News Items/PR20171204_GB_Earthquake_Code.html” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Duplicate ID “slider-button”.
Bad value “News Items/PR20171113_hpcwire_awards.html” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Bad value “News Items/PR20171101_caida_dos.html” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Bad value “News Items/PR20171030_Sherlock.html” for attribute “href” on element “a”: Illegal character in path segment: space is not allowed.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
End tag “div” seen, but there were open elements.
Unclosed element “ul”.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “slider-button” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “contentinfo” role is unnecessary for element “footer”.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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