Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The first occurrence of ID “seminar” was here.
The first occurrence of ID “footer” was here.
A table row was 1 columns wide, which is less than the column count established by the first row (2).
The first occurrence of ID “copy” was here.
The “navigation” role is unnecessary for element “nav”.
This document appears to be written in Japanese. Consider adding “lang="ja"” (or variant) to the “html” start tag.
Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “a” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “seminar”.
Bad value “” for attribute “id” on element “div”: An ID must not be the empty string.
Element “dl” is missing a required child element.
Element “dl” is missing a required instance of child element “dd”.
Element “style” not allowed as child of element “footer” in this context. (Suppressing further errors from this subtree.)
Duplicate ID “footer”.
The “frame” attribute on the “table” element is obsolete. Use CSS instead.
The “rules” attribute on the “table” element is obsolete. Use CSS instead.
Duplicate ID “copy”.
End tag for “body” seen, but there were unclosed elements.
Unclosed element “div”.
Japan JP