Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
Attribute “"” is not serializable as XML 1.0.
The first occurrence of ID “collapse0X1” was here.
This document appears to be written in Russian but the “html” start tag has “lang="en"”. Consider using “lang="ru"” (or variant) instead.
Errors:
Stray end tag “span”.
Attribute “bx_3218110189_1183” not allowed on element “div” at this point.
Attribute “bx_3218110189_1966” not allowed on element “div” at this point.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
Attribute “bx_3218110189_320” not allowed on element “div” at this point.
Attribute “bx_3218110189_318” not allowed on element “div” at this point.
Attribute “bx_3218110189_319” not allowed on element “div” at this point.
Element “section” not allowed as child of element “h2” in this context. (Suppressing further errors from this subtree.)
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Element “div” not allowed as child of element “a” in this context. (Suppressing further errors from this subtree.)
Saw “"” when expecting an attribute name. Probable cause: “=” missing immediately before.
Attribute “"” not allowed on element “ul” at this point.
Duplicate ID “collapse0X1”.
The “itemprop” attribute was specified, but the element is not a property of any item.
Russian Federation RU