code: function bodyHeight() {
          if (!editor.inline) {
            editor.contentStyles.push('body {min-height: 150px}');
            editor.on('click', function (e) {
              var rng;
  
              if (e.target.nodeName == 'HTML') {
                // Edge seems to only need focus if we set the range
                // the caret will become invisible and moved out of the iframe!!
                if (Env.ie > 11) {
                  editor.getBody().focus();
                  return;
                }
  
                // Need to store away non collapsed ranges since the focus call will mess that up see #7382
                rng = editor.selection.getRng();
                editor.getBody().focus();
                editor.selection.setRng(rng);
                editor.selection.normalize();
                editor.nodeChanged();
              }
            });
          }
        }
docs: IE 11 has an annoying issue where you can't move focus into the editor
  by clicking on the white area HTML element. We used to be able to to fix this with
  the fixCaretSelectionOfDocumentElementOnIe fix. But since M$ removed the selection
  object it's not possible anymore. So we need to hack in a ungly CSS to force the
  body to be at least 150px. If the user clicks the HTML element out side this 150px region
  we simply move the focus into the first paragraph. Not ideal since you loose the
  positioning of the caret but goot enough for most cases.