JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Hello World</h1>
<h1>Timé</h1>

JavaScript

$(document).ready(function(){
    var containNotLatin = false;
    $("h1").each(function() {
          var str = $(this).text();
          for(var i=0;i<str.length;i++) {
              containNotLatin = containNotLatin || ( str.charCodeAt(0)>127 ); // basic latin end at 0x7F (127) 
          }
    });
    alert(containNotLatin);
});