Sokenbicha.jp W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
The encoding “shift-jis” is not the preferred name of the character encoding in use. The preferred name is “shift_jis”. (Charmod C024)
Legacy encoding “shift_jis” used. Documents must use UTF-8.
The only allowed value for the “charset” attribute for the “meta” element is “utf-8”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
End tag “nav” seen, but there were open elements.
Unclosed element “div”.
Stray end tag “nav”.
Stray end tag “button”.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
The “type” attribute is unnecessary for JavaScript resources.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
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