{"action":"opened","issue":{"url":"https://api.github.com/repos/webcomponents/webcomponentsjs/issues/351","labels_url":"https://api.github.com/repos/webcomponents/webcomponentsjs/issues/351/labels{/name}","comments_url":"https://api.github.com/repos/webcomponents/webcomponentsjs/issues/351/comments","events_url":"https://api.github.com/repos/webcomponents/webcomponentsjs/issues/351/events","html_url":"https://github.com/webcomponents/webcomponentsjs/issues/351","id":95511721,"number":351,"title":"Custom Elements polyfill does not upgrade element with unused is attribute","user":{"login":"sorvell","id":78891,"avatar_url":"https://avatars.githubusercontent.com/u/78891?v=3","gravatar_id":"","url":"https://api.github.com/users/sorvell","html_url":"https://github.com/sorvell","followers_url":"https://api.github.com/users/sorvell/followers","following_url":"https://api.github.com/users/sorvell/following{/other_user}","gists_url":"https://api.github.com/users/sorvell/gists{/gist_id}","starred_url":"https://api.github.com/users/sorvell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sorvell/subscriptions","organizations_url":"https://api.github.com/users/sorvell/orgs","repos_url":"https://api.github.com/users/sorvell/repos","events_url":"https://api.github.com/users/sorvell/events{/privacy}","received_events_url":"https://api.github.com/users/sorvell/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-07-16T19:43:45Z","updated_at":"2015-07-16T19:43:45Z","closed_at":null,"body":"Given that `x-foo` is registered as a non-type extension element and then the element is created like this:\r\n\r\n```\r\n<x-foo is=\"some-definition\"></x-foo>\r\n```\r\n\r\nThe element will not upgrade. It should become the element registered at `x-foo`. This is a weird thing to do but the syntax should be supported."}}