Mirandawarning.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
The element “header” must not appear as a descendant of the “header” element.
Attribute “checked” not allowed on element “input” at this point.
The element “a” must not appear as a descendant of the “button” element.
End tag “button” seen, but there were open elements.
Unclosed element “a”.
No “a” element in scope but a “a” end tag seen.
The “center” element is obsolete. Use CSS instead.
No space between attributes.
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.
No “p” element in scope but a “p” end tag seen.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
Warnings:
Attribute “,” is not serializable as XML 1.0.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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