Constellation.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Element “meta” is missing one or more of the following attributes: “content”, “property”.
No space between attributes.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “alt” not allowed on element “a” at this point.
Attribute “xlink” not allowed on element “svg” at this point.
Attribute “alt” not allowed on element “image” at this point.
Duplicate ID “hexagonal-mask”.
Duplicate ID “grayscale”.
The “for” attribute of the “label” element must refer to a non-hidden form control.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “form” role is unnecessary for element “form”.
Empty heading.
The first occurrence of ID “hexagonal-mask” was here.
The first occurrence of ID “grayscale” was here.
The “contentinfo” role is unnecessary for element “footer”.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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