У вашего броузера проблема в совместимости с HTML5
The React hook useState() allows us to add local state to our React function components, but sometimes state can get a little messy. In his talk, Adam L. Barrett will show us how useReducer() may be able to clean up some state issues and help manage local component state.
Official useReducer docs: https://reactjs.org/docs/hooks-reference.html#usereducer
Hooks 1 talk from Adam L Barrett: https://www.youtube.com/watch?v=22ZgdZ0ccow&list=PL--xV5crGpX-ZJQ3DW0WvqyN0G9uGT4iE&index=3&t=0s
Hooks 2 talk from Christopher Baker: https://www.youtube.com/watch?v=N1msPjQX36I&list=PL--xV5crGpX99p1XW-V_B1XiB_MSgyfoW
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