Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Attribute “dificultad""” is not serializable as XML 1.0.
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).
Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
No space between attributes.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “Úbeda” not allowed on element “img” at this point.
Attribute “y” not allowed on element “img” at this point.
Attribute “baeza” not allowed on element “img” at this point.
Attribute “han” not allowed on element “img” at this point.
Attribute “sido” not allowed on element “img” at this point.
Attribute “fundamentales” not allowed on element “img” at this point.
Attribute “en” not allowed on element “img” at this point.
Attribute “estos” not allowed on element “img” at this point.
Attribute “años” not allowed on element “img” at this point.
Attribute “de” not allowed on element “img” at this point.
Attribute “dificultad""” not allowed on element “img” at this point.
The element “header” must not appear as a descendant of the “footer” element.
The “aria-labelledby” attribute must point to an element in the same document.
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