The conversation between human and AI assistant.
Can anyone provide code for first visit pop-up notification box?
Yes, can you provide JavaScript code for it?
Of course! Here's some code you can use: 

```
document.addEventListener("DOMContentLoaded", function(event) { 
   var visited = localStorage.getItem('visited');
   if (!visited) { 
       alert("Welcome to our website!"); 
       localStorage.setItem('visited', true);
   } 
});
```