JSFiddle - React, Tailwind, and code Playground

JavaScript

openAdModal = function() {
  alert(1);
};
if (typeof(Storage) !== "undefined") {
  if (sessionStorage.viewed) {
    if (sessionStorage.viewed < 3000) {
      sessionStorage.viewed = new Date().getTime();
      openAdModal();
    }
  } else {
    sessionStorage.viewed = new Date().getTime();
    openAdModal();
  }
} else {
  openAdModal();
}