Bogner.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.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “reference” not allowed on element “a” at this point.
Element “img” is missing required attribute “src”.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Element “source” is missing required attribute “srcset”.
Element “style” not allowed as child of element “main” in this context. (Suppressing further errors from this subtree.)
Element “style” not allowed as child of element “nav” in this context. (Suppressing further errors from this subtree.)
Attribute “border” not allowed on element “iframe” at this point.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “marginheight” attribute on the “iframe” element is obsolete. Use CSS instead.
The “marginwidth” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
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