Demo

Windows → Mac with one remote virtual display

Windows → Mac with two remote virtual displays

Two remote virtual displays shown in separate browser tabs, with a window dragged across displays right between the two tabs.

iOS → Windows

Safari on iOS connected to Windows' own Remote Desktop, scrolling horizontally with a two-finger swipe left or right.

iOS → Mac

Safari on iOS connected to a Mac's High Performance Screen Sharing, scrolling horizontally, with the network throughput meter shown.

Mac → Windows at Retina/HiDPI density with audio

Windows' own Remote Desktop shown at the Mac's Retina/HiDPI density, with the remote's sound playing in the browser.

Mac → Linux (wlshare on Sway) at Retina/HiDPI density with audio

wlshare on Sway shown at the Mac's Retina/HiDPI density, with the remote's sound, and the remote desktop resizing to follow the browser into and out of immersive full screen.