Transition between a web-view and a chat widget

The way of displaying content in a chat widget on Facebook Messenger should be consistent with the way of displaying content in a web-view on mobile. It helps users build the connection when viewing in-depth screens.

What are the other animation rules we need to keep in mind when designing chatbot widgets? I wrote a post on Medium here:
https://medium.com/@shanshen/must-have-animations-for-chatbots-15c031fd6bd3

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