Diabetes.org.uk W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “article” role is unnecessary for element “article”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “a” was here.
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
Errors:
A “charset” attribute on a “meta” element found after the first 1024 bytes.
Bad value “true” for attribute “async” on element “script”.
Attribute “content” not allowed on element “a” at this point.
Attribute “about” not allowed on element “article” at this point.
Attribute “about” not allowed on element “div” at this point.
Duplicate ID “a”.
The “itemprop” attribute was specified, but the element is not a property of any item.
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