getSelectionHTML = function () {
  var userSelection;
  if (window.getSelection) {
    // W3C Ranges
    userSelection = window.getSelection ();
    // Get the range:
    if (userSelection.getRangeAt)
      var range = userSelection.getRangeAt (0);
    else {
      var range = document.createRange ();
      range.setStart (userSelection.anchorNode, userSelection.anchorOffset);
      range.setEnd (userSelection.focusNode, userSelection.focusOffset);
    }
    // And the HTML:
    var clonedSelection = range.cloneContents ();
    var div = document.createElement ('div');
    div.appendChild (clonedSelection);
    return div.innerHTML;
  } else if (document.selection) {
    // Explorer selection, return the HTML
    userSelection = document.selection.createRange ();
    return userSelection.htmlText;
  } else {
    return '';
  }
};

http://oopstudios.com/

Again, as part of the DCODR development I had to find a decent way to get the selection HTML

Get HTML Of Selection

html

JavaScript