text: window.onload = function() {
      const webview = document.querySelector('#chromiumwebview')
      webview.addEventListener('dom-ready', () => {
          if (window.url !== "") {
              webview.src = window.url;
              window.url = "";
          }
      })
  
      const classroomscreen = document.getElementById('classroomscreen');
      const chromiumscreen = document.getElementById('chromiumscreen');
      const youtubescreen = document.getElementById('youtubescreen');
  
      const btnChromium = document.getElementById('gchromium');
      btnChromium.addEventListener('click', function() {
          let child = document.getElementById('chromiumwebviewchild');
          if (child !== null) {
              child.remove();
          }
          classroomscreen.classList.add('hidden');
          chromiumscreen.classList.remove('hidden');
          youtubescreen.classList.add('hidden');
      });
  
      const btnClassroom = document.getElementById('gclassroom');
      btnClassroom.addEventListener('click', function() {
          let child = document.getElementById('classroomwebviewchild');
          if (child !== null) {
              child.remove();
          }
          classroomscreen.classList.remove('hidden');
          chromiumscreen.classList.add('hidden');
          youtubescreen.classList.add('hidden');
      });
  
      const btnDesktop = document.getElementById('gdesktop');
      btnDesktop.addEventListener('click', function() {
          classroomscreen.classList.add('hidden');
          chromiumscreen.classList.add('hidden');
          youtubescreen.classList.add('hidden');
      });
  
      setTimeout(function() {
  
          date_time('timebar');
      }, 1000);
  }
  
  function date_time(id) {
      date = new Date;
      year = date.getFullYear();
      month = date.getMonth();
      months = new Array('January', 'February', 'March', 'April', 'May', 'June', 'Jully', 'August', 'September', 'October', 'November', 'December');
      d = date.getDate();
      day = date.getDay();
      days = new Array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday');
      h = date.getHours();
      if (h < 10) {
          h = "0" + h;
      }
      m = date.getMinutes();
      if (m < 10) {
          m = "0" + m;
      }
      s = date.getSeconds();
      if (s < 10) {
          s = "0" + s;
      }
      result = '' + h + ':' + m + ':' + s;
      document.getElementById(id).innerHTML = result;
      setTimeout('date_time("' + id + '");', '1000');
      return true;
  }