Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “handheld” for attribute “media” on element “link”: Deprecated media type “handheld”. For guidance, see the Media Types section in the current Media Queries specification.
Bad value “collapse” for attribute “role” on element “div”.
Bad value “ignore-empty-submit” for attribute “role” on element “form”.
Bad value “ignore-empty-target” for attribute “role” on element “input”.
Bad value “collapse-trigger” for attribute “role” on element “li”.
Bad value “collapse-target” for attribute “role” on element “div”.
Bad value “toggle-next-fade” for attribute “role” on element “div”.
Bad value “panel-item” for attribute “role” on element “div”.
Bad value “panel-item-main-link” for attribute “role” on element “a”.
Bad value “topic-time” for attribute “role” on element “time”.
Bad value “2017/08/03 08:25:03” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “panel-item-other-link” for attribute “role” on element “a”.
Bad value “2018/01/03 00:51:48” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2016/08/08 13:20:13” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2017/10/10 22:03:09” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Bad value “2017/10/23 21:07:22” for attribute “datetime” on element “time”: The literal did not satisfy the time-datetime format.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “banner” role is unnecessary for element “header”.
The “main” role is unnecessary for element “main”.
This document appears to be written in Japanese. Consider adding “lang="ja"” (or variant) to the “html” start tag.
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