Atcoder.jp W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “2017/12/02 04:04” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2017/11/17 22:49” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2017/11/17 22:55” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2017/11/10 19:59” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2017/11/10 20:20” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2017/11/04 00:00” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2017/10/27 20:35” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Warnings:
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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