Errors:
A “charset” attribute on a “meta” element found after the first 1024 bytes.
Bad value “” for attribute “width” on element “img”: The empty string is not a valid non-negative integer.
Bad value “” for attribute “height” on element “img”: The empty string is not a valid non-negative integer.
No space between attributes.
Saw “"” when expecting an attribute name. Probable cause: “=” missing immediately before.
Attribute “"” not allowed on element “div” 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 “allow” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
No “p” element in scope but a “p” end tag seen.
End tag “p” implied, but there were open elements.
Unclosed element “a”.
End tag “div” seen, but there were open elements.
No “a” element in scope but a “a” end tag seen.
Duplicate ID “link-to-top”.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Empty heading.
Attribute “"” is not serializable as XML 1.0.
The first occurrence of ID “link-to-top” was here.
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