Stepik.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Bad value “x-dns-prefetch-control” for attribute “http-equiv” on element “meta”.
Attribute “imgfield” not allowed on element “img” at this point.
Bad value “” for attribute “target” on element “a”: Browsing context name must be at least one character long.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “bgimgfield” not allowed on element “div” at this point.
Attribute “field” 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.
Attribute “bgimgfiled” not allowed on element “td” at this point.
Warnings:
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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