Warnings:
The “type” attribute is unnecessary for JavaScript resources.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
Potentially bad value “allow-scripts allow-popups allow-forms allow-same-origin” for attribute “sandbox” on element “iframe”: Setting both “allow-scripts” and “allow-same-origin” is not recommended, because it effectively enables an embedded page to break out of all sandboxing.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
Errors:
A “charset” attribute on a “meta” element found after the first 1024 bytes.
Attribute “value” not allowed on element “meta” at this point.
Element “meta” is missing one or more of the following attributes: “content”, “property”.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Attribute “user” not allowed on element “a” at this point.
Attribute “username” not allowed on element “div” at this point.
Attribute “isguest” not allowed on element “a” at this point.
Attribute “user” not allowed on element “div” at this point.
Bad value “100%” for attribute “width” on element “img”: Expected a digit but saw “%” instead.
Element “img” is missing required attribute “src”.
The element “button” must not appear as a descendant of the “a” element.
Bad value “100%” for attribute “width” on element “video”: 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The “frameborder” attribute on the “iframe” element is obsolete.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The “scrolling” attribute on the “iframe” element is obsolete.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.
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