Example code taken from http://stackoverflow.com/questions/13894514/google-diff-match-avoid-showing-new-lines/13894720#13894720

pretty-diff-with-textdiff-plugin.js

$(selector).prettyTextDiff({
  // options
});

pretty-diff.js

diff_match_patch.prototype.diff_prettyHtml = function(diffs) {
    var html = [];
    var pattern_amp = /&/g;
    var pattern_lt = /</g;
    var pattern_gt = />/g;
    var pattern_para = /\n/g;
    for (var x = 0; x < diffs.length; x++) {
      var op = diffs[x][0];    // Operation (insert, delete, equal)
      var data = diffs[x][1];  // Text of change.
      //var text = data.replace(pattern_amp, '&amp;').replace(pattern_lt, '&lt;')
      //    .replace(pattern_gt, '&gt;').replace(pattern_para, '&para;<br>');
      var text = data.replace(pattern_amp, '&amp;').replace(pattern_lt, '&lt;')
          .replace(pattern_gt, '&gt;').replace(pattern_para, '<br>');
      switch (op) {
        case DIFF_INSERT:
          html[x] = '<ins style="background:#e6ffe6;">' + text + '</ins>';
          break;
        case DIFF_DELETE:
          html[x] = '<del style="background:#ffe6e6;">' + text + '</del>';
          break;
        case DIFF_EQUAL:
          html[x] = '<span>' + text + '</span>';
          break;
      }
    }
    return html.join('');
  };