M4bl.org W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “field” for attribute “role” on element “div”.
Bad value “phone” for attribute “type” on element “input”.
Attribute “placeholder” is only allowed when the input type is “email”, “number”, “password”, “search”, “tel”, “text”, or “url”.
The “for” attribute of the “label” element must refer to a non-hidden form control.
Warnings:
Attribute “href” without an explicit value seen. The attribute may be dropped by IE7.
The “form” role is unnecessary for element “form”.
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