JSFiddle - React, Tailwind, and code Playground

HTML

<h3>
<a>Программа на<br> c#</a>
</h3>

JavaScript

var xpath = "//h3//a[contains(translate(text(), 'ABCDEFGHIJKLMNOPQRSTUVWXYZАБВГДЕЁЖЗИКЛМНОПРСТУФХЦЧШЩЬЫЪЭЮЯ', 'abcdefghijklmnopqrstuvwxyzабвгдеёжзиклмнопрстуфхцчшщьыъэюя'), 'программа на c#')]";
var res = document.evaluate(xpath, document, null, XPathResult.ANY_TYPE, null); 
var el = res.iterateNext();
if (el == undefined){
  alert("Not found!")
} else {
  alert(el.innerText);
 }