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 “ClearType” for attribute “http-equiv” on element “meta”.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Attribute “title” not allowed on element “svg” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “alt” not allowed on element “a” at this point.
Duplicate ID “XMLID_66_”.
Duplicate ID “XMLID_54_”.
Duplicate ID “XMLID_63_”.
Duplicate ID “XMLID_60_”.
Duplicate ID “XMLID_58_”.
Duplicate ID “XMLID_55_”.
Bad value “http://d279m997dpfwgl.cloudfront.net/api/2017/03/24/app-square copy.jpg” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Bad value “http://d279m997dpfwgl.cloudfront.net/api/2017/03/24/opensource copy.jpg” for attribute “src” on element “img”: Illegal character in path segment: space is not allowed.
Warnings:
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).
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “XMLID_66_” was here.
The first occurrence of ID “XMLID_54_” was here.
The first occurrence of ID “XMLID_63_” was here.
The first occurrence of ID “XMLID_60_” was here.
The first occurrence of ID “XMLID_58_” was here.
The first occurrence of ID “XMLID_55_” was here.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “contentinfo” role is unnecessary for element “footer”.
Text run is not in Unicode Normalization Form C.
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