Theknowledgeacademy.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Potentially bad value “en-an” for attribute “hreflang” on element “link”: The region subtag “an” is deprecated. Use “null” instead.
Potentially bad value “en-cs” for attribute “hreflang” on element “link”: The region subtag “cs” is deprecated. Use “null” instead.
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.
Errors:
“=” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
“"” in an unquoted attribute value. Probable causes: Attributes running together or a URL query string in an unquoted attribute value.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Malformed byte sequence: “e2”, “80”.
Attribute “async” not allowed on element “link” at this point.
Attribute “defer” not allowed on element “link” at this point.
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
Element “script” must not have attribute “async” unless attribute “src” is also specified.
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