yehuda

consider adding an event generator for cases like PTB [ChatMemberUpdated](https://github.com/python-telegram-bot/python-telegram-bot/blob/v22.0/telegram/_chatmemberupdated.py#L36-L214) or any other services messages.

[BUG] `backdrop-filter` CSS property flagged as invalid

2

**Describe the bug** When using the CSS property `backdrop-filter` in a stylesheet, the validator incorrectly flags it as non-existent: > `"backdrop-filter": Property "backdrop-filter" doesn't exist.` This property is part of...