{"action":"created","issue":{"url":"https://api.github.com/repos/csstree/csstree/issues/20","repository_url":"https://api.github.com/repos/csstree/csstree","labels_url":"https://api.github.com/repos/csstree/csstree/issues/20/labels{/name}","comments_url":"https://api.github.com/repos/csstree/csstree/issues/20/comments","events_url":"https://api.github.com/repos/csstree/csstree/issues/20/events","html_url":"https://github.com/csstree/csstree/issues/20","id":178093032,"number":20,"title":"-apple-system is missing for font-family property","user":{"login":"andreypopp","id":30594,"avatar_url":"https://avatars.githubusercontent.com/u/30594?v=3","gravatar_id":"","url":"https://api.github.com/users/andreypopp","html_url":"https://github.com/andreypopp","followers_url":"https://api.github.com/users/andreypopp/followers","following_url":"https://api.github.com/users/andreypopp/following{/other_user}","gists_url":"https://api.github.com/users/andreypopp/gists{/gist_id}","starred_url":"https://api.github.com/users/andreypopp/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/andreypopp/subscriptions","organizations_url":"https://api.github.com/users/andreypopp/orgs","repos_url":"https://api.github.com/users/andreypopp/repos","events_url":"https://api.github.com/users/andreypopp/events{/privacy}","received_events_url":"https://api.github.com/users/andreypopp/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2016-09-20T15:25:54Z","updated_at":"2016-09-21T10:32:17Z","closed_at":null,"body":"See https://webkit.org/blog/3709/using-the-system-font-in-web-content/"},"comment":{"url":"https://api.github.com/repos/csstree/csstree/issues/comments/248573080","html_url":"https://github.com/csstree/csstree/issues/20#issuecomment-248573080","issue_url":"https://api.github.com/repos/csstree/csstree/issues/20","id":248573080,"user":{"login":"lahmatiy","id":270491,"avatar_url":"https://avatars.githubusercontent.com/u/270491?v=3","gravatar_id":"","url":"https://api.github.com/users/lahmatiy","html_url":"https://github.com/lahmatiy","followers_url":"https://api.github.com/users/lahmatiy/followers","following_url":"https://api.github.com/users/lahmatiy/following{/other_user}","gists_url":"https://api.github.com/users/lahmatiy/gists{/gist_id}","starred_url":"https://api.github.com/users/lahmatiy/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lahmatiy/subscriptions","organizations_url":"https://api.github.com/users/lahmatiy/orgs","repos_url":"https://api.github.com/users/lahmatiy/repos","events_url":"https://api.github.com/users/lahmatiy/events{/privacy}","received_events_url":"https://api.github.com/users/lahmatiy/received_events","type":"User","site_admin":false},"created_at":"2016-09-21T10:32:17Z","updated_at":"2016-09-21T10:32:17Z","body":"@andreypopp You are talking about `<generic-family>`. All keywords except `system` are defined, see [`font-family` syntax](https://csstree.github.io/docs/syntax.html#properties:font-family).\r\nI'm not sure about adding `-apple-system` (unprefixed version nobody supports so we shouldn't add it for sure). But current syntax allows using `-apple-system` w/o additions.\r\n![image](https://cloud.githubusercontent.com/assets/270491/18707634/a851aee0-7fff-11e6-9ca1-792cc3fe2147.png)\r\n"}}
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