onoffline event listener

/**
 * We can trigger onoffline event by using addEventListener
 * */
 
 window.addEventListener("offline", (event) => {
     //here we run our code, what to do
     //when connection is lost
 })
 
 
 /**
  * We can trigger onoffline event by using onoffline
  * */
  
  window.onoffline = event => {
     //here we run our code, what to do
     //when connection is lost
  }