{"action":"opened","issue":{"url":"https://api.github.com/repos/slightlyoff/IntersectionObserver/issues/51","labels_url":"https://api.github.com/repos/slightlyoff/IntersectionObserver/issues/51/labels{/name}","comments_url":"https://api.github.com/repos/slightlyoff/IntersectionObserver/issues/51/comments","events_url":"https://api.github.com/repos/slightlyoff/IntersectionObserver/issues/51/events","html_url":"https://github.com/slightlyoff/IntersectionObserver/issues/51","id":110711494,"number":51,"title":"Definition of `IntersectionObserverEntry.time` needs to say what the zero time is","user":{"login":"bzbarsky","id":1457979,"avatar_url":"https://avatars.githubusercontent.com/u/1457979?v=3","gravatar_id":"","url":"https://api.github.com/users/bzbarsky","html_url":"https://github.com/bzbarsky","followers_url":"https://api.github.com/users/bzbarsky/followers","following_url":"https://api.github.com/users/bzbarsky/following{/other_user}","gists_url":"https://api.github.com/users/bzbarsky/gists{/gist_id}","starred_url":"https://api.github.com/users/bzbarsky/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bzbarsky/subscriptions","organizations_url":"https://api.github.com/users/bzbarsky/orgs","repos_url":"https://api.github.com/users/bzbarsky/repos","events_url":"https://api.github.com/users/bzbarsky/events{/privacy}","received_events_url":"https://api.github.com/users/bzbarsky/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-10-09T18:18:00Z","updated_at":"2015-10-09T18:18:00Z","closed_at":null,"body":"Unfortunately, `DomHighResTimeStamp` doesn't have a well-defined zero time (thank you, web perf working group), so whenever you use it you have to say what your zero time is...  You probably want the navigationStart of something, but please coordinate with the webperf people for the right way to phrase this, especially in cases when a single `Window` has multiple `Document`s or vice versa."}}