{"action":"created","issue":{"url":"https://api.github.com/repos/validator/validator/issues/263","repository_url":"https://api.github.com/repos/validator/validator","labels_url":"https://api.github.com/repos/validator/validator/issues/263/labels{/name}","comments_url":"https://api.github.com/repos/validator/validator/issues/263/comments","events_url":"https://api.github.com/repos/validator/validator/issues/263/events","html_url":"https://github.com/validator/validator/issues/263","id":142072501,"number":263,"title":"itemprop=\"mainEntityOfPage\" - Error: Element META is missing required attribute CONTENT.","user":{"login":"M2spbRu","id":16288581,"avatar_url":"https://avatars.githubusercontent.com/u/16288581?v=3","gravatar_id":"","url":"https://api.github.com/users/M2spbRu","html_url":"https://github.com/M2spbRu","followers_url":"https://api.github.com/users/M2spbRu/followers","following_url":"https://api.github.com/users/M2spbRu/following{/other_user}","gists_url":"https://api.github.com/users/M2spbRu/gists{/gist_id}","starred_url":"https://api.github.com/users/M2spbRu/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/M2spbRu/subscriptions","organizations_url":"https://api.github.com/users/M2spbRu/orgs","repos_url":"https://api.github.com/users/M2spbRu/repos","events_url":"https://api.github.com/users/M2spbRu/events{/privacy}","received_events_url":"https://api.github.com/users/M2spbRu/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":2,"created_at":"2016-03-19T15:36:56Z","updated_at":"2016-03-19T19:20:45Z","closed_at":null,"body":"In web page http://www.m2-spb.ru/com01_print_test\r\nI've used itemprop=\"mainEntityOfPage\" without attribute CONTENT.\r\n\r\nFrom https://validator.w3.org/nu/?doc=http%3A%2F%2Fwww.m2-spb.ru%2Fcom01_print_test\r\nI've got \"Error: Element META is missing required attribute CONTENT\"\r\n\r\nFrom https://developers.google.com/structured-data/testing-tool/\r\nand from http://www.onlinewebcheck.com/check.php\r\nI've got \"0 error messages\".\r\n\r\nWhere is the truth?"},"comment":{"url":"https://api.github.com/repos/validator/validator/issues/comments/198773207","html_url":"https://github.com/validator/validator/issues/263#issuecomment-198773207","issue_url":"https://api.github.com/repos/validator/validator/issues/263","id":198773207,"user":{"login":"unor","id":6901294,"avatar_url":"https://avatars.githubusercontent.com/u/6901294?v=3","gravatar_id":"","url":"https://api.github.com/users/unor","html_url":"https://github.com/unor","followers_url":"https://api.github.com/users/unor/followers","following_url":"https://api.github.com/users/unor/following{/other_user}","gists_url":"https://api.github.com/users/unor/gists{/gist_id}","starred_url":"https://api.github.com/users/unor/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/unor/subscriptions","organizations_url":"https://api.github.com/users/unor/orgs","repos_url":"https://api.github.com/users/unor/repos","events_url":"https://api.github.com/users/unor/events{/privacy}","received_events_url":"https://api.github.com/users/unor/received_events","type":"User","site_admin":false},"created_at":"2016-03-19T19:20:45Z","updated_at":"2016-03-19T19:20:45Z","body":"I think this is a duplicate of https://github.com/validator/validator/issues/192.\r\n\r\nGoogle’s Microdata example [is invalid](http://stackoverflow.com/a/34467088).\r\n\r\nIf you want to give a URL value for the `mainEntityOfPage` property, you [must](http://stackoverflow.com/a/24659620/1591669) use a `link` element:\r\n\r\n    <link itemprop=\"mainEntityOfPage\" href=\"http://www.m2-spb.ru/com01\">\r\n\r\n(In that case you can’t provide a type like `WebPage` for the document; it’s [either an item with type (in which case you need something like `div`), or a URL](http://stackoverflow.com/a/34245547/1591669).)"}}