This page demonstates issues with <video> element in PWA/"Home Screen web app" on iOS, namely:

• video.requestPictureInPicture does nothing even when document.pictureInPictureEnabled is true (FB17983433)
• Videos playing from ManagedMediaSource don't keep the device awake unless user has Attention Aware features enabled and looks at a screen or, starting with iOS 18.4, site enables Screen Wake Lock (FB17984089)
• Full Screen UI issues (iOS 17.4 screenshots of player in Safari and player in PWA; FB17984554):
  • Home indicator doesn't hide
  • When changing volume, both player and system volume sliders are displayed
  • On devices with Dynamic Island, "Currently playing" live activity is displayed

The issues are still present in iOS/iPadOS 26 Developer Beta 1