Techacademy.jp W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “type” attribute is unnecessary for JavaScript resources.
Consider avoiding viewport values that prevent users from resizing documents.
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).
Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.
Errors:
Bad value “true” for attribute “async” on element “script”.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
No “li” element in scope but a “li” end tag seen.
Attribute “input_html” not allowed on element “input” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The element “h3” must not appear as a descendant of the “th” element.
The “aria-labelledby” attribute must point to an element in the same document.
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