It's serious buy menosan The X-Frame-Options is an HTTP response header that allows webmasters to define if and how their websites can be loaded into frame elements on other sites. It comes with three options: ALLOW, DENY, and SAMEORIGIN, the latter meaning a page can only be framed by other pages with the same origin -- same domain, URI scheme and port. There's a fourth option called ALLOW-FROM, but it's not supported by all browsers. 必須 2000文字以内 [bbs:youtube:(Youtubeの動画ID)]と書くとYoutubeの動画が貼れます。(例:[bbs:youtube:OQThUAQ0UN0])