{"action":"opened","issue":{"url":"https://api.github.com/repos/WICG/scroll-animations/issues/16","repository_url":"https://api.github.com/repos/WICG/scroll-animations","labels_url":"https://api.github.com/repos/WICG/scroll-animations/issues/16/labels{/name}","comments_url":"https://api.github.com/repos/WICG/scroll-animations/issues/16/comments","events_url":"https://api.github.com/repos/WICG/scroll-animations/issues/16/events","html_url":"https://github.com/WICG/scroll-animations/issues/16","id":230729818,"number":16,"title":"What is the definition of 'scrollable' for resolving orientation == 'auto'?","user":{"login":"stephenmcgruer","id":153264,"avatar_url":"https://avatars2.githubusercontent.com/u/153264?v=3","gravatar_id":"","url":"https://api.github.com/users/stephenmcgruer","html_url":"https://github.com/stephenmcgruer","followers_url":"https://api.github.com/users/stephenmcgruer/followers","following_url":"https://api.github.com/users/stephenmcgruer/following{/other_user}","gists_url":"https://api.github.com/users/stephenmcgruer/gists{/gist_id}","starred_url":"https://api.github.com/users/stephenmcgruer/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/stephenmcgruer/subscriptions","organizations_url":"https://api.github.com/users/stephenmcgruer/orgs","repos_url":"https://api.github.com/users/stephenmcgruer/repos","events_url":"https://api.github.com/users/stephenmcgruer/events{/privacy}","received_events_url":"https://api.github.com/users/stephenmcgruer/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2017-05-23T14:32:40Z","updated_at":"2017-05-23T14:32:40Z","closed_at":null,"body":"This question came up during the Chromium implementation of ScrollTimeline. The definition of orientation states:\r\n\r\n\"auto\r\nIf only one direction is scrollable, selects that direction. Otherwise selects the direction along the block axis.\"\r\n\r\nThe definition of 'scrollable', however, is causing some disagreement. I had initially assumed that it meant that the CSS overflow property in the given axis is non-visible, _however_ [per the CSS3 box spec](https://www.w3.org/TR/css3-box/#overflow-x) it is not possible to have one axis be visible and the other non-visible:\r\n\r\n\"The computed values of ‘overflow-x’ and ‘overflow-y’ are the same as their specified values, except that some combinations with ‘visible’ are not possible: if one is specified as ‘visible’ and the other is ‘scroll’ or ‘auto’, then ‘visible’ is set to ‘auto’.\"\r\n\r\nWhat is the intended definition of 'scrollable' here?"}}
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