JSFiddle - React, Tailwind, and code Playground

by riot26

HTML

ИНН <span class="official">7806159085</span>
Фамилия <span class="official">ИВАНОВ</span>

CSS

.official-squared {
  border: 1px solid black;
  padding: 2px 5px;
}
.official-squared:not(:last-child) {
  border-right: 0;
}

.official-squared::last-child {
  border-left: 0;
}

JavaScript

var official_elements = document.getElementsByClassName('official');
for (var i=0; i<official_elements.length; i++) {
	official_elements[i].innerHTML =  official_elements[i].innerHTML.replace(/(.)/g, '<span class="official-squared">$1</span>');
}