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in https://lists.w3.org/Archives/Public/www-style/2016Aug/0009.html\n"},"comment":{"url":"https://api.github.com/repos/w3c/csswg-drafts/issues/comments/262326276","html_url":"https://github.com/w3c/csswg-drafts/pull/602#issuecomment-262326276","issue_url":"https://api.github.com/repos/w3c/csswg-drafts/issues/602","id":262326276,"user":{"login":"tabatkins","id":682840,"avatar_url":"https://avatars.githubusercontent.com/u/682840?v=3","gravatar_id":"","url":"https://api.github.com/users/tabatkins","html_url":"https://github.com/tabatkins","followers_url":"https://api.github.com/users/tabatkins/followers","following_url":"https://api.github.com/users/tabatkins/following{/other_user}","gists_url":"https://api.github.com/users/tabatkins/gists{/gist_id}","starred_url":"https://api.github.com/users/tabatkins/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tabatkins/subscriptions","organizations_url":"https://api.github.com/users/tabatkins/orgs","repos_url":"https://api.github.com/users/tabatkins/repos","events_url":"https://api.github.com/users/tabatkins/events{/privacy}","received_events_url":"https://api.github.com/users/tabatkins/received_events","type":"User","site_admin":false},"created_at":"2016-11-22T18:37:31Z","updated_at":"2016-11-22T18:37:31Z","body":"While this copies the circularity-breaker of font-size/em in handling line-height using lh, it doesn't address the new cycle we're adding when font-size uses lh and line-height uses em.\r\n\r\nWe can either break this situation by making *both* refer to the parent element's metrics, or by just making one of them refer to the parent element and letting the other one rely as usual. \r\n\r\nI think I prefer treating the em unit as slightly more fundamental, so that line-height/em will use the parent element's metrics, and then font-size/lh will just rely on the element's metrics as usual. However, I could easily be convinced otherwise by a decent argument.  We probably want to poll implementors on what seems best to them."}}
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