text: const screensize = document.querySelector('.doc-screensize');
  const iframe = document.querySelector('.doc-page-iframe');
  
  function changeScreensize(event) {
      const screensizeData = event.target.getAttribute('data-screensize');
      
      if(event.target && screensizeData) {
          iframe.setAttribute('data-framesize', screensizeData);
          event.preventDefault();
      }
  }
  
  screensize.addEventListener('click', changeScreensize);
  
  
  