Code comments and minor fixes.

IPython/html/static/notebook/js/cell.js

@@ -125,11 +125,14 b' var IPython = (function (IPython) {'
                 return a.has(b).length !==0 || a.is(b);
             }
             if (that.mode === 'edit') {
+                // Most of the time, when a cell is in edit mode and focusout
+                // fires, it means we should enter command mode. But there are cases
+                // when we should not enter command mode.
                 setTimeout(function () {
                     var trigger = true;
                     var target = $(document.activeElement);
-                    var completer = that.element.find($('div.completions'));
-                    var tooltip = $('div#tooltip')
+                    var completer = $('div.completions');
+                    var tooltip = $('div#tooltip');
                     if (target.length > 0) {
                         // If the focused element (target) is inside the cell
                         // (that.element) don't enter command mode.

IPython/html/static/notebook/js/completer.js

@@ -218,6 +218,8 b' var IPython = (function (IPython) {'
         this.complete = $('<div/>').addClass('completions');
         this.complete.attr('id', 'complete');
 
+        // Currently webkit doesn't use the size attr correctly. See:
+        // https://code.google.com/p/chromium/issues/detail?id=4579
         this.sel = $('<select style="width: auto"/>')
             .attr('multiple', 'true')
             .attr('size', Math.min(10, this.raw_result.length));
@@ -255,8 +257,6 b' var IPython = (function (IPython) {'
         this.build_gui_list(this.raw_result);
 
         this.sel.focus();
-        // This needs to be after the focus() call because that puts the notebook into
-        // command mode.
         IPython.keyboard_manager.null_mode();
         // Opera sometimes ignores focusing a freshly created node
         if (window.opera) setTimeout(function () {