{"action":"created","issue":{"url":"https://api.github.com/repos/ampproject/amphtml/issues/5603","repository_url":"https://api.github.com/repos/ampproject/amphtml","labels_url":"https://api.github.com/repos/ampproject/amphtml/issues/5603/labels{/name}","comments_url":"https://api.github.com/repos/ampproject/amphtml/issues/5603/comments","events_url":"https://api.github.com/repos/ampproject/amphtml/issues/5603/events","html_url":"https://github.com/ampproject/amphtml/issues/5603","id":182937744,"number":5603,"title":"Stop using IntersectionObserver polyfill in ads if native support is present","user":{"login":"cramforce","id":89679,"avatar_url":"https://avatars.githubusercontent.com/u/89679?v=3","gravatar_id":"","url":"https://api.github.com/users/cramforce","html_url":"https://github.com/cramforce","followers_url":"https://api.github.com/users/cramforce/followers","following_url":"https://api.github.com/users/cramforce/following{/other_user}","gists_url":"https://api.github.com/users/cramforce/gists{/gist_id}","starred_url":"https://api.github.com/users/cramforce/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/cramforce/subscriptions","organizations_url":"https://api.github.com/users/cramforce/orgs","repos_url":"https://api.github.com/users/cramforce/repos","events_url":"https://api.github.com/users/cramforce/events{/privacy}","received_events_url":"https://api.github.com/users/cramforce/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/ampproject/amphtml/labels/Related%20to:%20Performance","name":"Related to: Performance","color":"d4c5f9"}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":7,"created_at":"2016-10-14T00:39:04Z","updated_at":"2016-10-20T21:23:03Z","closed_at":null,"body":"Now that stable Chrome has IntersectionObserver we should use it instead of the postMessage mechanism.\r\n\r\nCC @lannka "},"comment":{"url":"https://api.github.com/repos/ampproject/amphtml/issues/comments/255232322","html_url":"https://github.com/ampproject/amphtml/issues/5603#issuecomment-255232322","issue_url":"https://api.github.com/repos/ampproject/amphtml/issues/5603","id":255232322,"user":{"login":"lannka","id":8496897,"avatar_url":"https://avatars.githubusercontent.com/u/8496897?v=3","gravatar_id":"","url":"https://api.github.com/users/lannka","html_url":"https://github.com/lannka","followers_url":"https://api.github.com/users/lannka/followers","following_url":"https://api.github.com/users/lannka/following{/other_user}","gists_url":"https://api.github.com/users/lannka/gists{/gist_id}","starred_url":"https://api.github.com/users/lannka/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lannka/subscriptions","organizations_url":"https://api.github.com/users/lannka/orgs","repos_url":"https://api.github.com/users/lannka/repos","events_url":"https://api.github.com/users/lannka/events{/privacy}","received_events_url":"https://api.github.com/users/lannka/received_events","type":"User","site_admin":false},"created_at":"2016-10-20T21:23:03Z","updated_at":"2016-10-20T21:23:03Z","body":"3. it's to provide the `initialIntersection`. I reconsidered this, my proposal won't work. We have to pass the info from host doc via URL fragment. \r\n\r\n1. the starting time is different though. in host doc, it's relative to the page load. inside iframe, it's relative to the iframe load. though most likely the creative only cares about the duration, it might still be good to consolidate. 3) requires the time to be relative to page load. That means we will intercept the InOb and subtract an offset.\r\n"}}
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