Trendmicro.co.jp W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Start tag “head” seen but an element of the same type was already open.
Element “meta” is missing one or more of the following attributes: “content”, “property”.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.
The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.
Element “input” is missing required attribute “alt”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
This document appears to be written in Japanese. Consider adding “lang="ja"” (or variant) to the “html” start tag.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
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