203443 2019-10-25 20:19:23 -0700 The m_videoFullscreenMode attribute of HTMLMediaElement does not always store the real presentation mode of the video element 2019-11-14 18:55:08 -0800 1 1 1 Unclassified WebKit Media Safari 12 Unspecified Unspecified NEW InRadar P2 Normal --- 1 peng.liu6 peng.liu6 eric.carlson jer.noble webkit-bug-importer oldest_to_newest 1584157 0 peng.liu6 2019-10-25 20:19:23 -0700 Presentation mode change is a multiple-steps process, and the web content process and UI process need to exchange messages multiple times to guarantee the state transition is completed. The implementation of HTMLMediaElement does not consider the asynchronous process to complete the mode change. For example, it sets the m_videoFullscreenMode to be picture-in-picture before the transition from inline to picture-in-picture is completed. In addition, the timing of presentation mode change related callbacks need to be reviewed and changed is necessary. 1584158 1 peng.liu6 2019-10-25 20:22:15 -0700 I mean: "if necessary". 1590392 2 webkit-bug-importer 2019-11-14 18:55:08 -0800 <rdar://problem/57213972>