Firebox.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.
Errors:
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Attribute “alt” not allowed on element “a” 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.
Element “ul” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Attribute “href” not allowed on element “button” at this point.
The element “button” must not appear as a descendant of the “a” element.
Bad value “100%” for attribute “width” on element “img”: Expected a digit but saw “%” instead.
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
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