Created attachment 320394 [details] An instance of Telegram web app corruption How to reproduce: 1. Login in https://web.telegram.org/ (You will need a telephone number) 2. Open a chat with someone. Fortunately you can open a chat with yourself, which is useful for testing. 3. Have the other person start typing without sending a message, just enough for the "User is typing..." message to arrive. If you are chatting with yourself, you just need to type. Expected behavior: "User is typing..." should appear. Actual behavior: All scrollables within the document get corrupted turning either white, black or blue until the user stops typing.
Created attachment 320395 [details] Corruption where the content turns black and the rendered scrollbar is still visible
I can't reproduce it in Fedora 26 Epiphany with Intel drivers. I can reproduce it everytime in Arch Linux in both Epiphany and the minibrowser with NVIDIA drivers.