Errors:
Element “h1” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The element “header” must not appear as a descendant of the “header” element.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Forbidden code point U+0003.
Attribute “src” not allowed on element “div” at this point.
Element “img” is missing required attribute “src”.
Duplicate attribute “class”.
Attribute “content” not allowed on element “div” at this point.
Bad value “popup” for attribute “rel” on element “a”: The string “popup” is not a registered keyword.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “for” attribute of the “label” element must refer to a non-hidden form control.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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).
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