Allaboutjazz.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Element name “gcse:searchbox-only” cannot be represented as XML 1.0.
Errors:
Duplicate attribute “class”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “option” without attribute “label” must not be empty.
Duplicate attribute “target”.
Bad element name “gcse:searchbox-only”: Code point “U+003A” is not allowed
The “aria-labelledby” attribute must point to an element in the same document.
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