The app uses tdweb and my own library for creating UI.

Implemented features:
- authorization
- animated monkey
- chat list
- message list
- text messages, messages with photos, stickers (including animated stickers). Animation of sticker starts if it appears in the viewport
- handling updating of last message, the user status and status of the message (read/unread) in the chat and message list
- loading chat history by scrolling

Known issues:
- a monkey sticker remains on the page after registration. It can be fixed by reloading the page.
- broken UI on Safari

Here is you can see the app with some minor fixes.
https://topcodder.github.io/telegram-web/

The overall speed and size are below average. The design doesn't fully comply with the mockups. The monkey animation is looped when entering a code, sometimes the monkey doesn't disappear when opening chats, and it appears at the top of the messages screen. It's not possible to log in using certain countries numbers.

16 MB was downloaded when I opened the website. Looks like td web or something is used.

misaligned spinner in NEXT button; monkey doesnt go out after auth; font used is actually bad

This doesn't handle errors (PHONE_CODE_INVALID).

I can't send messages.