Itscope.com W3C HTML Markup Validation
HTML markup errors and warnings
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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.
Bad value “” for attribute “id” on element “div”: An ID must not be the empty string.
No “p” element in scope but a “p” end tag seen.
Duplicate ID “”.
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.
Bad value “” for attribute “sizes” on element “img”: Must not be empty.
Bad value “” for attribute “srcset” on element “img”: Must contain one or more image candidate strings.
The “aria-controls” attribute must point to an element in the same document.
Warnings:
The first occurrence of ID “” was here.
Attribute “';” is not serializable as XML 1.0.
Empty heading.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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