Question - Give an example to demonstrate how do you define custom key modifier aliases in Vue.js? 
          
        
        Answer - 
        
We can define custom key modifier aliases via the global config.keyCodes. Following are some guidelines for the properties:
We can't use camelCase. Instead, we should use a kebab-case with double quotation marks.
We can define multiple values in an array format.
See the example:
Vue.config.keyCodes = {  
  f1: 112,  
  "media-play-pause": 179,  
  down: [40, 87]  
}