Added support for picture-in-picture, which is implemented as an OS function.
Only video and audio can be popped up and played from the browser or app screen.
Currently, it supports the following environments.
・iOS/iPadOS browser version/app version ・Windows/Mac Chrome browser version
In addition, in the above environment, "Background playback (audio only)", which was only supported in the app version, will be discontinued because the function is duplicated.
In the smartphone environment, you can watch it as it is while using another app, so you can enjoy it without interruption
