JSFiddle - React, Tailwind, and code Playground

JavaScript

$(document.body).append('<div id="advblock" style="position: absolute; opacity: 1; top: 0; left: 0;">hh</div>');
setTimeout(function() {
  if (!$('#advblock').height()) {
    alert(1);
  }
  $("#advblock").remove()  
}, 1);