Webmonkey.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Forbidden code point U+0008.
Attribute “to” not allowed on element “a” at this point.
Attribute “alt” not allowed on element “a” at this point.
Element “h4” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “presentation” for attribute “role” on element “a”.
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
Bad value “email” for attribute “type” on element “input”.
Bad value “submit” for attribute “type” on element “input”.
Bad value “listitem” for attribute “role” on element “ul”.
An element with “role=listitem” must be contained in, or owned by, an element with “role=list” or “role=group”.
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
The “itemprop” attribute was specified, but the element is not a property of any item.
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