Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “verify” not allowed on element “article” at this point.
Attribute “verify” not allowed on element “section” at this point.
Attribute “allow” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Attribute “verify” not allowed on element “div” at this point.
A slash was not immediately followed by “>”.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “cursos""” 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.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “alt” not allowed on element “a” at this point.
The “aria-labelledby” attribute must point to an element in the same document.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
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.
Attribute “cursos""” is not serializable as XML 1.0.
Empty heading.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
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