Schuberth.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 “navigation” role is unnecessary for element “nav”.
Errors:
Bad value “true” for attribute “async” on element “script”.
Table column 2 established by element “td” has no cells beginning in it.
Element “source” is missing required attribute “srcset”.
Element “div” not allowed as child of element “picture” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “h2” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “src” on element “img”: Must be non-empty.
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