{"action":"created","issue":{"url":"https://api.github.com/repos/whatwg/html/issues/100","labels_url":"https://api.github.com/repos/whatwg/html/issues/100/labels{/name}","comments_url":"https://api.github.com/repos/whatwg/html/issues/100/comments","events_url":"https://api.github.com/repos/whatwg/html/issues/100/events","html_url":"https://github.com/whatwg/html/issues/100","id":104859192,"number":100,"title":"Consider aligning WHATWG main element definition with W3C definition","user":{"login":"stevefaulkner","id":835859,"avatar_url":"https://avatars.githubusercontent.com/u/835859?v=3","gravatar_id":"","url":"https://api.github.com/users/stevefaulkner","html_url":"https://github.com/stevefaulkner","followers_url":"https://api.github.com/users/stevefaulkner/followers","following_url":"https://api.github.com/users/stevefaulkner/following{/other_user}","gists_url":"https://api.github.com/users/stevefaulkner/gists{/gist_id}","starred_url":"https://api.github.com/users/stevefaulkner/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/stevefaulkner/subscriptions","organizations_url":"https://api.github.com/users/stevefaulkner/orgs","repos_url":"https://api.github.com/users/stevefaulkner/repos","events_url":"https://api.github.com/users/stevefaulkner/events{/privacy}","received_events_url":"https://api.github.com/users/stevefaulkner/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/whatwg/html/labels/normative%20change","name":"normative change","color":"207de5"}],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":82,"created_at":"2015-09-04T09:39:52Z","updated_at":"2015-09-23T22:26:40Z","closed_at":null,"body":"The main element was designed and implemented based on the concept of there being a single instance within a document, the markup pattern was based on data of [id value usage](http://www.w3.org/TR/html-main-element/#notes) in the wild. The whatwg definition differs markedly from the orginal definition. This leads to [confusion for developers](https://twitter.com/peeja/status/639451464608432128).\r\nThe [W3C nu html checker](https://validator.w3.org/nu/), which is used by many, throws an error when main is used as per whatwg. Data derived from [webdevdata.org](http://webdevdata.org/) shows that >97% of usage of the &lt;main> element is as per the W3C definition and anecdata from users that consume the semantics suggests that one main element per page is the expected and most useful pattern. In general consumers landmark semantics report that the utility of landmarks is reduced as the number/instances of landmark elements in a document increases. \r\nThe alignment would involve changes to the main and body element definitions.\r\ncurrent W3C definitions:\r\n* [main element](http://www.w3.org/TR/html51/semantics.html#the-main-element)\r\n* [body element](http://www.w3.org/TR/html51/semantics.html#the-body-element)\r\n"},"comment":{"url":"https://api.github.com/repos/whatwg/html/issues/comments/142748219","html_url":"https://github.com/whatwg/html/issues/100#issuecomment-142748219","issue_url":"https://api.github.com/repos/whatwg/html/issues/100","id":142748219,"user":{"login":"karlgroves","id":873419,"avatar_url":"https://avatars.githubusercontent.com/u/873419?v=3","gravatar_id":"","url":"https://api.github.com/users/karlgroves","html_url":"https://github.com/karlgroves","followers_url":"https://api.github.com/users/karlgroves/followers","following_url":"https://api.github.com/users/karlgroves/following{/other_user}","gists_url":"https://api.github.com/users/karlgroves/gists{/gist_id}","starred_url":"https://api.github.com/users/karlgroves/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/karlgroves/subscriptions","organizations_url":"https://api.github.com/users/karlgroves/orgs","repos_url":"https://api.github.com/users/karlgroves/repos","events_url":"https://api.github.com/users/karlgroves/events{/privacy}","received_events_url":"https://api.github.com/users/karlgroves/received_events","type":"User","site_admin":false},"created_at":"2015-09-23T22:26:40Z","updated_at":"2015-09-23T22:26:40Z","body":"@Hixie says\r\n> If you present me with a data mining exercise that I believe has the possibility to bring new and actionable data to the table,\r\n\r\nActually @stevefaulkner already did this, very early in this conversation. He did so using data publicly available from WebDevData using a statistically significant data set with a very low margin of error. You can, if you so choose to, replicate his investigation using that same open data to verify or dispute his results. \r\n\r\nUnless there's any dispute as to the accuracy or completeness of his claim, it would appear that he has provided you with \"new and actionable data\".  That data says, pretty clearly, that authors understand that intent for the `<main>` element is that there should be one and only `<main>`.\r\n\r\nIn short, you have 22/24 participants in this conversation in agreement that there be one and only `<main>` and you have data demonstrating that there is  \"... >97% of usage of the <main> element is as per the W3C definition...\"\r\n\r\nGiven the above, when can we expect the WHATWG spec to be brought in line with W3C spec WRT the `<main>` and `<body>` elements as suggested by Steve Faulkner?\r\n"}}