Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Stray end tag “div”.
Bad value “button” for attribute “type” on element “a”: Subtype missing.
The “center” element is obsolete. Use CSS instead.
Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
Element “style” not allowed as child of element “center” in this context. (Suppressing further errors from this subtree.)
Bad value “540px” for attribute “height” on element “iframe”: Expected a digit but saw “p” instead.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” 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The “frameborder” attribute on the “iframe” element is obsolete.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The “scrolling” attribute on the “iframe” element is obsolete.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.
Duplicate ID “ytEmbed”.
Element “img” is missing required attribute “src”.
Text not allowed in element “iframe” in this context.
End tag “center” seen, but there were open elements.
Unclosed element “div”.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The “type” attribute is unnecessary for JavaScript resources.
The first occurrence of ID “ytEmbed” was here.
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