1. mediadevices api: `getdisplaymedia()`

2. mediadevices api: `getdisplaymedia()`: audio capture support

3. mediadevices api: `getdisplaymedia()`: `controller` option

4. mediadevices api: `getdisplaymedia()`: `prefercurrenttab` option

5. mediadevices api: `getdisplaymedia()`: `selfbrowsersurface` option

6. mediadevices api: `getdisplaymedia()`: `surfaceswitching` option

7. mediadevices api: `getdisplaymedia()`: `systemaudio` option