Concentinc.jp W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
The “banner” role is unnecessary for element “header”.
The “main” role is unnecessary for element “main”.
The “contentinfo” role is unnecessary for element “footer”.
Errors:
Bad value “2018-5-31” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2018-5-29” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2018-5-21” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2018-5-17” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2018-5-15” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2018-5-8” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
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