Errors:
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Stray doctype.
Attribute “xmlns:php” not allowed here.
Attribute “xmlns:math” not allowed here.
Stray end tag “head”.
Start tag “body” seen but an element of the same type was already open.
Text not allowed in element “iframe” in this context.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “h2” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)
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.)
Attribute “headerborder” not allowed on element “img” at this point.
Attribute “alt” not allowed on element “div” at this point.
The “center” element is obsolete. Use CSS instead.
Warnings:
Attribute with the local name “xmlns:php” is not serializable as XML 1.0.
Attribute with the local name “xmlns:math” is not serializable as XML 1.0.
This document appears to be written in Czech. Consider adding “lang="cs"” (or variant) to the “html” start tag.
Czech Republic CZ