21stcentech.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.
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.
Attribute “name” not allowed on element “span” at this point.
Attribute “value” not allowed on element “input” at this point.
Element “input” is missing required attribute “alt”.
Attribute “name” not allowed on element “div” at this point.
Attribute “allow” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
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