Android version of Chrome browser cannot be implemented through preventDefault to prohibit the entry of specific characters in < input >?

imagine that < input > listens to the keydown event, determines the keyCode of the event parameter object, and then calls preventDefault () to block the input of illegal characters.

sample code: 

   


 the version of the mobile operating system is Android 7.1.1. 


 Why is the output in the Chrome browser inconsistent with Firefox, and why can"t input be blocked through  preventDefault () ?
Chrome javascript dom vue.js
Dec.10,2021

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