code: function renderEmptyBlocksFix() {
          var emptyBlocksCSS;
  
          // IE10+
          if (getDocumentMode() >= 10) {
            emptyBlocksCSS = '';
            each('p div h1 h2 h3 h4 h5 h6'.split(' '), function (name, i) {
              emptyBlocksCSS += (i > 0 ? ',' : '') + name + ':empty';
            });
  
            editor.contentStyles.push(emptyBlocksCSS + '{padding-right: 1px !important}');
          }
        }
docs: IE10 doesn't properly render block elements with the right height until you add contents to them.
  This fixes that by adding a padding-right to all empty text block elements.
  See: https://connect.microsoft.com/IE/feedback/details/743881