Add line break within tooltips

Question

How can line breaks be added within a HTML tooltip?

I tried using
and \\n within the tooltip as follows:

Answer 1

use should work (I've tested in Chrome, Firefox and Edge):

let users = [{username: 'user1'}, {username: 'user2'}, {username: 'user3'}];
let favTitle = '';
for(let j = 0; j < users.length; j++)
    favTitle += users[j].username + "
";

$("#item").append('Favorite');