{"action":"created","issue":{"url":"https://api.github.com/repos/postcss/autoprefixer/issues/498","labels_url":"https://api.github.com/repos/postcss/autoprefixer/issues/498/labels{/name}","comments_url":"https://api.github.com/repos/postcss/autoprefixer/issues/498/comments","events_url":"https://api.github.com/repos/postcss/autoprefixer/issues/498/events","html_url":"https://github.com/postcss/autoprefixer/issues/498","id":101433874,"number":498,"title":"Is this intended behavior? (css keyframes & transform)","user":{"login":"cbier","id":2236701,"avatar_url":"https://avatars.githubusercontent.com/u/2236701?v=3","gravatar_id":"","url":"https://api.github.com/users/cbier","html_url":"https://github.com/cbier","followers_url":"https://api.github.com/users/cbier/followers","following_url":"https://api.github.com/users/cbier/following{/other_user}","gists_url":"https://api.github.com/users/cbier/gists{/gist_id}","starred_url":"https://api.github.com/users/cbier/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cbier/subscriptions","organizations_url":"https://api.github.com/users/cbier/orgs","repos_url":"https://api.github.com/users/cbier/repos","events_url":"https://api.github.com/users/cbier/events{/privacy}","received_events_url":"https://api.github.com/users/cbier/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":3,"created_at":"2015-08-17T14:30:32Z","updated_at":"2015-08-17T14:34:04Z","closed_at":"2015-08-17T14:31:15Z","body":"Regarding the Autoprefixer output: Does `@-webkit-keyframes` need `-webkit-transform` AND `transform`? Shouldn't it only need `-webkit-transform`?\r\n\r\nConversely the same thing is happening for `@keyframes`. It has `-webkit-transform` in it.\r\n\r\nIs this intended behavior? If so, why? Thanks!\r\n\r\n\r\n**CSS**\r\n```\r\n.hidden {\r\n    animation: slide-out linear .2s forwards;\r\n}\r\n\r\n@keyframes slide-out {\r\n    0% {\r\n        transform: translateY(-275px);\r\n    }\r\n    100% {\r\n        transform: translateY(0px);\r\n    }\r\n```\r\n\r\n**Autoprefixer output**\r\n```\r\n.hidden {\r\n  -webkit-animation: slide-out linear 0.2s forwards;\r\n          animation: slide-out linear 0.2s forwards; \r\n}\r\n\r\n@-webkit-keyframes slide-out {\r\n  0% {\r\n    -webkit-transform: translateY(-275px);\r\n            transform: translateY(-275px); }\r\n  100% {\r\n    -webkit-transform: translateY(0px);\r\n            transform: translateY(0px); }\r\n}\r\n\r\n@keyframes slide-out {\r\n  0% {\r\n    -webkit-transform: translateY(-275px);\r\n            transform: translateY(-275px);\r\n}\r\n  100% {\r\n    -webkit-transform: translateY(0px);\r\n            transform: translateY(0px); }\r\n}\r\n```"},"comment":{"url":"https://api.github.com/repos/postcss/autoprefixer/issues/comments/131842047","html_url":"https://github.com/postcss/autoprefixer/issues/498#issuecomment-131842047","issue_url":"https://api.github.com/repos/postcss/autoprefixer/issues/498","id":131842047,"user":{"login":"cbier","id":2236701,"avatar_url":"https://avatars.githubusercontent.com/u/2236701?v=3","gravatar_id":"","url":"https://api.github.com/users/cbier","html_url":"https://github.com/cbier","followers_url":"https://api.github.com/users/cbier/followers","following_url":"https://api.github.com/users/cbier/following{/other_user}","gists_url":"https://api.github.com/users/cbier/gists{/gist_id}","starred_url":"https://api.github.com/users/cbier/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cbier/subscriptions","organizations_url":"https://api.github.com/users/cbier/orgs","repos_url":"https://api.github.com/users/cbier/repos","events_url":"https://api.github.com/users/cbier/events{/privacy}","received_events_url":"https://api.github.com/users/cbier/received_events","type":"User","site_admin":false},"created_at":"2015-08-17T14:34:04Z","updated_at":"2015-08-17T14:34:04Z","body":"But why does it add prefixed properties in the unprefixed `@keyframes`?"}}