Inktip.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “navigation” role is unnecessary for element “nav”.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Attribute “;"” is not serializable as XML 1.0.
Empty heading.
Errors:
Duplicate attribute “id”.
Attribute “href” not allowed on element “button” at this point.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “;"” not allowed on element “img” 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.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “aria-labelledby” attribute must point to an element in the same document.
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