Errors:
Bad value “https://www.w3.org/1999/xhtml” for the attribute “xmlns” (only “http://www.w3.org/1999/xhtml” permitted here).
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “navigation” for attribute “role” on element “ul”.
Forbidden code point U+009d.
No space between attributes.
Attribute “” not allowed on element “div” at this point.
The “align” attribute on the “p” element is obsolete. Use CSS instead.
The “center” element is obsolete. Use CSS instead.
Duplicate ID “printout_URL”.
The “align” attribute on the “h3” element is obsolete.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 document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “form” role is unnecessary for element “form”.
Attribute “” is not serializable as XML 1.0.
The first occurrence of ID “printout_URL” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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