Rsag-online.de W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “ata-toggle” not allowed on element “button” at this point.
Bad value “search” for attribute “role” on element “input”.
Element “div” not allowed as child of element “label” in this context. (Suppressing further errors from this subtree.)
The “form” attribute must refer to a form element.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “button” role is unnecessary for element “button”.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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