Angloamerican.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://www.w3.org/1999/xhtml” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
Duplicate ID “rd-nav-all-level3”.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Warnings:
Attribute “xmlns” is not serializable as XML 1.0.
Consider avoiding viewport values that prevent users from resizing documents.
The “type” attribute is unnecessary for JavaScript resources.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The first occurrence of ID “rd-nav-all-level3” was here.
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The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
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