var modal = new ModalWebView(function () {
  console.log('modal closed');
});
modal.setErrorTextColor(0xFFFFFF);
modal.setErrorBackgroundColor(0xEE0044);
modal.setOrientation('portrait');
var button = document.getElementById('some_element');
button.addEventListener('click', function() {
  modal.open('https://www.example.com/', 'WebView title');
});