JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" id="operand1"/ value=";alert('xss');"> + <input type="text" id="operand2" value="5"/> = <span id="answer"></span>
<br/>
<button onClick="calculate()">
Calculate
</button>

JavaScript

function calculate() {
	var op1 = $('#operand1').val();
  var op2 = $('#operand2').val();
  var answer = eval(op1 + ' + ' + op2);
  $('#answer').text(answer);
}