{"action":"opened","issue":{"url":"https://api.github.com/repos/facebook/react/issues/5298","labels_url":"https://api.github.com/repos/facebook/react/issues/5298/labels{/name}","comments_url":"https://api.github.com/repos/facebook/react/issues/5298/comments","events_url":"https://api.github.com/repos/facebook/react/issues/5298/events","html_url":"https://github.com/facebook/react/issues/5298","id":113651720,"number":5298,"title":"Confusing handling of \"is\" within props","user":{"login":"mhahn","id":704593,"avatar_url":"https://avatars.githubusercontent.com/u/704593?v=3","gravatar_id":"","url":"https://api.github.com/users/mhahn","html_url":"https://github.com/mhahn","followers_url":"https://api.github.com/users/mhahn/followers","following_url":"https://api.github.com/users/mhahn/following{/other_user}","gists_url":"https://api.github.com/users/mhahn/gists{/gist_id}","starred_url":"https://api.github.com/users/mhahn/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mhahn/subscriptions","organizations_url":"https://api.github.com/users/mhahn/orgs","repos_url":"https://api.github.com/users/mhahn/repos","events_url":"https://api.github.com/users/mhahn/events{/privacy}","received_events_url":"https://api.github.com/users/mhahn/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-10-27T18:31:54Z","updated_at":"2015-10-27T18:31:54Z","closed_at":null,"body":"Within: https://github.com/facebook/react/blob/master/src/renderers/dom/shared/HTMLDOMPropertyConfig.js#L108 `is` is listed as a supported HTMLDOMProperty.\r\n\r\nHowever, including `is` anywhere in the component means that react treats it as a custom component and will just dump all key=\"value\" pairs without handling other supported HTMLDOM properties like `className` etc.\r\n\r\nI came across this when trying to do server side rendering for a third party library that expands `is` into `style={...}`. \r\n\r\nI don't expect react to care about the external library overloading `is`, but is it confusing that its listed as a valid HTML property in the release notes, but if you use it it also treats the DOM element as custom."}}