Describe the bug:

VS2019 UWP WebView
Does not play Twitch and Twitch embed, black screen, infinite loading.

Reproduce

Test 1 - WebView UWP project:
Iniciate UWP project, add WebView with source url:
https://www.twitch.tv/
https://player.twitch.tv/?channel=esl_csgo&parent=localhost

Go Project Properties > Tab: Debug, in Debugger type: Application process set to 'Script' to inspect WebView console

Test 2 - Another browser same enginer:
insert the source url:
https://www.twitch.tv/
https://player.twitch.tv/?channel=esl_csgo&parent=localhost

on JavaScript Browser: https://github.com/MicrosoftEdge/JSBrowser

Output:
Exception was thrown at line 1, column 124483 in https://static.twitchcdn.net/assets/vendor-a6a1f255f35b353a66f3.js
0x800a1391 - JavaScript runtime error: 'globalThis' is not defined
Exception was thrown at line 1, column 845709 in https://static.twitchcdn.net/assets/player-main-3d0abb9af23b3bb9aecd.js
0x8000ffff - JavaScript runtime error: Argumento inválido
Exception was thrown at line 1, column 750875 in https://static.twitchcdn.net/assets/player-main-3d0abb9af23b3bb9aecd.js
0x8000ffff - JavaScript runtime error: Argumento inválido
Exception was thrown at line 1, column 750875 in https://static.twitchcdn.net/assets/player-main-3d0abb9af23b3bb9aecd.js
0x8000ffff - JavaScript runtime error: Argumento inválido
Exception was thrown at line 1, column 889787 in https://static.twitchcdn.net/assets/player-main-3d0abb9af23b3bb9aecd.js
0x8000ffff - JavaScript runtime error: Argumento inválido
Exception was thrown at line 1, column 750875 in https://static.twitchcdn.net/assets/player-main-3d0abb9af23b3bb9aecd.js
....