{"action":"created","issue":{"url":"https://api.github.com/repos/webcomponents/webcomponentsjs/issues/438","labels_url":"https://api.github.com/repos/webcomponents/webcomponentsjs/issues/438/labels{/name}","comments_url":"https://api.github.com/repos/webcomponents/webcomponentsjs/issues/438/comments","events_url":"https://api.github.com/repos/webcomponents/webcomponentsjs/issues/438/events","html_url":"https://github.com/webcomponents/webcomponentsjs/issues/438","id":115995116,"number":438,"title":"Double upgrade of custom elements in cloned document fragments","user":{"login":"csuwildcat","id":131786,"avatar_url":"https://avatars.githubusercontent.com/u/131786?v=3","gravatar_id":"","url":"https://api.github.com/users/csuwildcat","html_url":"https://github.com/csuwildcat","followers_url":"https://api.github.com/users/csuwildcat/followers","following_url":"https://api.github.com/users/csuwildcat/following{/other_user}","gists_url":"https://api.github.com/users/csuwildcat/gists{/gist_id}","starred_url":"https://api.github.com/users/csuwildcat/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/csuwildcat/subscriptions","organizations_url":"https://api.github.com/users/csuwildcat/orgs","repos_url":"https://api.github.com/users/csuwildcat/repos","events_url":"https://api.github.com/users/csuwildcat/events{/privacy}","received_events_url":"https://api.github.com/users/csuwildcat/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2015-11-09T23:57:45Z","updated_at":"2015-11-10T00:01:53Z","closed_at":null,"body":"When cloning a document fragment containing custom elements, it appears the custom elements inside the cloned fragment are double upgraded.\r\n\r\nHere's a reduced test case to illustrate the issue: http://jsbin.com/cowonugidu/edit?html,js,output"},"comment":{"url":"https://api.github.com/repos/webcomponents/webcomponentsjs/issues/comments/155238500","html_url":"https://github.com/webcomponents/webcomponentsjs/issues/438#issuecomment-155238500","issue_url":"https://api.github.com/repos/webcomponents/webcomponentsjs/issues/438","id":155238500,"user":{"login":"ebidel","id":238208,"avatar_url":"https://avatars.githubusercontent.com/u/238208?v=3","gravatar_id":"","url":"https://api.github.com/users/ebidel","html_url":"https://github.com/ebidel","followers_url":"https://api.github.com/users/ebidel/followers","following_url":"https://api.github.com/users/ebidel/following{/other_user}","gists_url":"https://api.github.com/users/ebidel/gists{/gist_id}","starred_url":"https://api.github.com/users/ebidel/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ebidel/subscriptions","organizations_url":"https://api.github.com/users/ebidel/orgs","repos_url":"https://api.github.com/users/ebidel/repos","events_url":"https://api.github.com/users/ebidel/events{/privacy}","received_events_url":"https://api.github.com/users/ebidel/received_events","type":"User","site_admin":false},"created_at":"2015-11-10T00:01:52Z","updated_at":"2015-11-10T00:01:52Z","body":"I see `I should only appear once.` twice in Chrome (native custom elements), without loading the polyfill."}}