You can overwrite data saved in storage under a specific key. Let's try and write some data:
localStorage.setItem('key', '1');
let value1 = localStorage.getItem('key');
console.log(value1); // shows '1'
Now let's ovewrite this data:
localStorage.setItem('key', '2');
let value2 = localStorage.getItem('key');
console.log(value2); // shows '2'
The user visits the site, then refreshes the page, then refreshes again, and so on. Make a page refresh counter. Display the counter value on the screen every time page is updated.