Slader.com W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “type” attribute is unnecessary for JavaScript resources.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The “charset” attribute on the “script” element is obsolete.
Errors:
Element “section” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “hr” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “data” on element “object”: Must be non-empty.
Bad value “auto” for attribute “height” on element “object”: Expected a digit but saw “a” instead.
Bad value “100vw” for attribute “width” on element “object”: Expected a digit but saw “v” instead.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “alt” not allowed on element “object” at this point.
The “aria-labelledby” attribute must point to an element in the same document.
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