Better tabindex support.

IPython/frontend/html/notebook/static/js/codecell.js

@@ -29,6 +29,7 b' var IPython = (function (IPython) {'
 
     CodeCell.prototype.create_element = function () {
         var cell =  $('<div></div>').addClass('cell border-box-sizing code_cell vbox');
+        cell.attr('tabindex','2');
         var input = $('<div></div>').addClass('input hbox');
         input.append($('<div/>').addClass('prompt input_prompt'));
         var input_area = $('<div/>').addClass('input_area box-flex1');

IPython/frontend/html/notebook/static/js/savewidget.js

@@ -30,6 +30,7 b' var IPython = (function (IPython) {'
         var left_panel_width = $('div#left_panel').outerWidth();
         var left_panel_splitter_width = $('div#left_panel_splitter').outerWidth();
         $('span#save_widget').css({marginLeft:left_panel_width+left_panel_splitter_width});
+        $('input#notebook_name').attr('tabindex','1');
     };
 
 

IPython/frontend/html/notebook/static/js/textcell.js

@@ -27,6 +27,7 b' var IPython = (function (IPython) {'
 
     TextCell.prototype.create_element = function () {
         var cell = $("<div>").addClass('cell text_cell border-box-sizing');
+        cell.attr('tabindex','2');
         var input_area = $('<div/>').addClass('text_cell_input');
         this.code_mirror = CodeMirror(input_area.get(0), {
             indentUnit : 4,