Errors:
A document must not include more than one “meta” element with its “name” attribute set to the value “description”.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
No “p” element in scope but a “p” end tag seen.
No space between attributes.
The “center” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “align” attribute on the “div” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “script” must not have attribute “async” unless attribute “src” is also specified.
“"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “center;” not allowed on element “div” at this point.
Attribute “overflow:” not allowed on element “div” at this point.
Attribute “visible;” not allowed on element “div” at this point.
Attribute “visibility:” not allowed on element “div” at this point.
Attribute “visible;\"” not allowed on element “div” at this point.
Bad value “\"text/javascript\"” for attribute “type” on element “script”: Expected a token character but saw “\” instead.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “complementary” role is unnecessary for element “aside”.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
Attribute “center;” is not serializable as XML 1.0.
Attribute “overflow:” is not serializable as XML 1.0.
Attribute “visible;” is not serializable as XML 1.0.
Attribute “visibility:” is not serializable as XML 1.0.
Attribute “visible;\"” is not serializable as XML 1.0.
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