[1] Picture-in-Picture (2018-02-21 22:34:20 +09:00) https://wicg.github.io/picture-in-picture/

[2] Picture-in-Picture (PiP) · Issue #226 · w3ctag/design-reviews (2018-03-18 13:55:04 +09:00) https://github.com/w3ctag/design-reviews/issues/226

[3] picture-in-picture/explainer.md at master · WICG/picture-in-picture (2018-03-18 13:55:11 +09:00) https://github.com/WICG/picture-in-picture/blob/master/explainer.md

[4] WICG/picture-in-picture: Picture-in-Picture (PiP) (2018-03-18 13:55:35 +09:00) https://github.com/WICG/picture-in-picture

[5] RFP: Picture-in-Picture · Issue #72 · mozilla/standards-positions (2018-03-18 13:55:41 +09:00) https://github.com/mozilla/standards-positions/issues/72

[6] Picture-in-Picture (PiP) - Chrome Platform Status (2018-08-25 02:20:02 +09:00) https://www.chromestatus.com/feature/5729206566649856

[7] Picture-in-Picture (PiP)  |  Web  |  Google Developers (2019-11-22 17:55:36 +09:00) https://developers.google.com/web/updates/2017/09/picture-in-picture

[8] Picture-in-Picture (PiP) - Chrome Platform Status (2020-04-14 11:16:02 +09:00) https://www.chromestatus.com/feature/5729206566649856

[9] webkitSetPresentationMode - HTMLVideoElement | Apple Developer Documentation (2020-04-14 13:57:59 +09:00) https://developer.apple.com/documentation/webkitjs/htmlvideoelement/1631224-webkitsetpresentationmode