use `
` should work (I've tested in **Chrome**, **Firefox** and **Edge**):
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
let users = [{username: 'user1'}, {username: 'user2'}, {username: 'user3'}]; let favTitle = ''; for(let j = 0; j < users.length; j++) favTitle += users[j].username + "&#13;";
$("#item").append('<i title="In favorite users: &#13;' + favTitle + '">Favorite</i>');
<!-- language: lang-html -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div id = item></div>
<!-- end snippet -->

`&#13;` should work (I've tested in Chrome, Firefox and Edge):
<!-- begin snippet: js hide: false console: true babel: false -->
<!-- language: lang-js -->
let users = [{username: 'user1'}, {username: 'user2'}, {username: 'user3'}]; let favTitle = ''; for(let j = 0; j < users.length; j++) favTitle += users[j].username + "&#13;";
$("#item").append('<i title="In favorite users: &#13;' + favTitle + '">Favorite</i>');
<!-- language: lang-html -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <div id = item></div>
<!-- end snippet -->