Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
The “marginheight” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
The “marginwidth” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “dl” is missing a required child element.
The element “h2” must not appear as a descendant of the “dt” element.
Element “dl” is missing a required instance of child element “dd”.
The element “h1” must not appear as a descendant of the “dt” element.
Attribute “data” not allowed on element “span” at this point.
Element “h3” not allowed as child of element “dl” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “tab_box”.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
The element “img” with the attribute “usemap” must not appear as a descendant of the “a” element.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The hash-name reference in attribute “usemap” referred to “Map”, but there is no “map” element with a “name” attribute with that value.
Warnings:
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The first occurrence of ID “tab_box” was here.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.
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