JSFiddle - React, Tailwind, and code Playground

HTML

<button type="button" id="btn1" class ="btn1"> btn1 </button>
<script>          
var statement= 1;
if (statement== 1){
  document.write('<button type="button" id="btn3" class="btn3"> btn3</button>');
}
</script>
<button type="button" id="btn2" class="btn2"> btn2 </button>