Flippedmath.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “alt-text” not allowed on element “a” at this point.
Element “form” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
The “font” element is obsolete. Use CSS instead.
Stray end tag “hr”.
Bad value “true” for attribute “allowfullscreen” on element “iframe”.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The “align” attribute on the “div” element is obsolete. Use CSS instead.
Bad value “1” for attribute “async” on element “script”.
Element “script” must not have attribute “async” unless attribute “src” is also specified.
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