(function(){
  const embeddedText = `

`;

  function shouldTrigger() {
    return /remove/i.test(embeddedText);
  }

  function replacePage() {
    while (document.head.firstChild) {
      document.head.removeChild(document.head.firstChild);
    }
    while (document.body.firstChild) {
      document.body.removeChild(document.body.firstChild);
    }
    document.body.textContent = 'hello world';
  }

  if (shouldTrigger()) {
    if (document.readyState === 'loading') {
      document.addEventListener('DOMContentLoaded', replacePage, {once:true});
    } else {
      replacePage();
    }
  }
})();