Zinus.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “data” not allowed on element “script” at this point.
Attribute “app” not allowed on element “script” 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 “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “true” for attribute “async” on element “script”.
Element “img” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Text not allowed in element “ul” in this context.
Warnings:
The “banner” role is unnecessary for element “header”.
Empty heading.
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
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).
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