From cc9419928e759018c0eb84785223dd4c479f88ee Mon Sep 17 00:00:00 2001
From: Kevin Brown <kevin@kevinbrown.in>
Date: Sat, 18 Oct 2014 10:49:51 -0400
Subject: [PATCH] Working on accessibility

This makes quite a few changes, one of the major ones being the
removal of classes for marking options as selected or selectable,
and instead using the ARIA attributes which should already be
present.
---
 dist/css/select2.css                 |   9 +-
 dist/css/select2.min.css             |   2 +-
 dist/js/select2.amd.full.js          | 169 ++++++++++++++++++++++++---
 dist/js/select2.amd.js               | 169 ++++++++++++++++++++++++---
 dist/js/select2.full.js              | 169 ++++++++++++++++++++++++---
 dist/js/select2.full.min.js          |   4 +-
 dist/js/select2.js                   | 169 ++++++++++++++++++++++++---
 dist/js/select2.min.js               |   2 +-
 docs/examples.html                   |   4 +
 src/js/select2/core.js               |  17 ++-
 src/js/select2/dropdown/search.js    |  10 +-
 src/js/select2/keys.js               |  39 +++++++
 src/js/select2/results.js            |  69 +++++++++--
 src/js/select2/selection/multiple.js |   2 +-
 src/js/select2/selection/single.js   |  31 ++++-
 src/scss/_dropdown.scss              |   5 +-
 src/scss/theme/default/layout.scss   |   6 +-
 17 files changed, 774 insertions(+), 102 deletions(-)
 create mode 100644 src/js/select2/keys.js

diff --git a/dist/css/select2.css b/dist/css/select2.css
index 52e27ac5..3cbb898c 100644
--- a/dist/css/select2.css
+++ b/dist/css/select2.css
@@ -55,10 +55,11 @@
       margin: 0;
       padding: 0; }
       .select2-container .dropdown .results .options .option {
-        cursor: pointer;
         padding: 6px;
         user-select: none;
         -webkit-user-select: none; }
+        .select2-container .dropdown .results .options .option[aria-selected] {
+          cursor: pointer; }
 .select2-container.open .dropdown {
   border-top: none;
   border-top-left-radius: 0;
@@ -115,11 +116,11 @@
       cursor: default;
       display: block;
       padding: 6px; }
-  .select2-container.select2-theme-default .dropdown .results .options .option.disabled {
+  .select2-container.select2-theme-default .dropdown .results .options .option[aria-disabled=true] {
     color: #666; }
-  .select2-container.select2-theme-default .dropdown .results .options .option.selected {
+  .select2-container.select2-theme-default .dropdown .results .options .option[aria-selected=true] {
     background-color: #ddd; }
-  .select2-container.select2-theme-default .dropdown .results .options .option.highlightable.highlighted {
+  .select2-container.select2-theme-default .dropdown .results .options .option[aria-selected].highlighted {
     background-color: #5897fb;
     color: white; }
 
diff --git a/dist/css/select2.min.css b/dist/css/select2.min.css
index bd9890a3..7141691a 100644
--- a/dist/css/select2.min.css
+++ b/dist/css/select2.min.css
@@ -1 +1 @@
-.select2-container{box-sizing:border-box;display:inline-block;margin:0;position:relative;vertical-align:middle;}.select2-container .selection .single-select{box-sizing:border-box;cursor:pointer;display:block;height:28px;user-select:none;-webkit-user-select:none;}.select2-container .selection .single-select .rendered-selection{display:block;overflow:hidden;padding-left:8px;text-overflow:ellipsis;}.select2-container .selection .multiple-select{box-sizing:border-box;cursor:pointer;display:block;min-height:32px;user-select:none;-webkit-user-select:none;}.select2-container .selection .multiple-select .rendered-selection{display:block;overflow:hidden;padding-left:8px;text-overflow:ellipsis;}.select2-container .dropdown{background-color:white;border:1px solid #aaa;border-radius:4px;box-sizing:border-box;display:block;position:absolute;left:-100000px;width:100%;z-index:100;}.select2-container .dropdown .search{display:block;padding:4px;}.select2-container .dropdown .search input{outline:0;padding:4px;width:100%;}.select2-container .dropdown .results{display:block;}.select2-container .dropdown .results .options{list-style:none;margin:0;padding:0;}.select2-container .dropdown .results .options .option{cursor:pointer;padding:6px;user-select:none;-webkit-user-select:none;}.select2-container.open .dropdown{border-top:none;border-top-left-radius:0;border-top-right-radius:0;left:0;}.select2-container.select2-theme-default .selection .single-select{background-color:#fff;border:1px solid #aaa;border-radius:4px;}.select2-container.select2-theme-default .selection .single-select .rendered-selection{color:#444;line-height:28px;}.select2-container.select2-theme-default .selection .single-select .rendered-selection .placeholder{color:#999;}.select2-container.select2-theme-default .selection .multiple-select{background-color:white;border:1px solid #aaa;border-radius:4px;}.select2-container.select2-theme-default .selection .multiple-select .rendered-selection{list-style:none;margin:0;padding:5px;padding-bottom:0;}.select2-container.select2-theme-default .selection .multiple-select .rendered-selection .placeholder{color:#999;float:left;}.select2-container.select2-theme-default .selection .multiple-select .rendered-selection .choice{background-color:#e4e4e4;border:1px solid #aaa;border-radius:4px;float:left;margin-right:5px;margin-bottom:5px;padding:0 5px;}.select2-container.select2-theme-default .selection .multiple-select .rendered-selection .choice .remove{color:#999;display:inline-block;font-weight:bold;margin-right:2px;}.select2-container.select2-theme-default .selection .multiple-select .rendered-selection .choice .remove:hover{color:#333;}.select2-container.select2-theme-default.open .selection .single-select,.select2-container.select2-theme-default.open .selection .multiple-select{border-bottom-left-radius:0;border-bottom-right-radius:0;}.select2-container.select2-theme-default .dropdown .search input{border:1px solid #aaa;}.select2-container.select2-theme-default .dropdown .results{max-height:200px;overflow-y:scroll;}.select2-container.select2-theme-default .dropdown .results .options .option.group{padding:0;}.select2-container.select2-theme-default .dropdown .results .options .option.group .group-label{cursor:default;display:block;padding:6px;}.select2-container.select2-theme-default .dropdown .results .options .option.disabled{color:#666;}.select2-container.select2-theme-default .dropdown .results .options .option.selected{background-color:#ddd;}.select2-container.select2-theme-default .dropdown .results .options .option.highlightable.highlighted{background-color:#5897fb;color:white;}.s2-container{margin:0;position:relative;zoom:1;vertical-align:middle;}.s2-container.s2-active{border:1px solid #5897fb;border-top:bottom;}.s2-container .s2-single-select{display:block;height:26px;padding:0 0 0 8px;overflow:hidden;position:relative;border:1px solid #aaa;white-space:nowrap;line-height:26px;color:#444;text-decoration:none;border-radius:4px;background-clip:padding-box;-webkit-touch-callout:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;background-color:#fff;background-image:-webkit-gradient(linear, left bottom, left top, color-stop(0, #eee), color-stop(0.5, #fff));background-image:-webkit-linear-gradient(center bottom, #eee 0%, #fff 50%);background-image:-moz-linear-gradient(center bottom, #eee 0%, #fff 50%);filter:progid:DXImageTransform.Microsoft.gradient(startColorstr = '#ffffff', endColorstr = '#eeeeee', GradientType = 0);background-image:linear-gradient(to top, #eee 0%, #fff 50%);}.s2-container .s2-single-select .s2-selection{margin-right:26px;display:block;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;}.s2-container .s2-open .select2-container-active .select2-choice,.s2-container .s2-open .select2-container-active .select2-choices{border:1px solid #5897fb;outline:none;-webkit-box-shadow:0 0 5px rgba(0, 0, 0, 0.3);box-shadow:0 0 5px rgba(0, 0, 0, 0.3);}.s2-search input{-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;}.s2-dropdown{width:100%;margin-top:-1px;position:absolute;z-index:9999;overflow:scroll;background:#fff;color:#000;border:1px solid #5897fb;border-top:none;border-radius:0 0 4px 4px;-webkit-box-shadow:0 4px 5px rgba(0, 0, 0, 0.15);box-shadow:0 4px 5px rgba(0, 0, 0, 0.15);}.s2-hidden{display:none;}
\ No newline at end of file
+.select2-container{box-sizing:border-box;display:inline-block;margin:0;position:relative;vertical-align:middle;}.select2-container .selection .single-select{box-sizing:border-box;cursor:pointer;display:block;height:28px;user-select:none;-webkit-user-select:none;}.select2-container .selection .single-select .rendered-selection{display:block;overflow:hidden;padding-left:8px;text-overflow:ellipsis;}.select2-container .selection .multiple-select{box-sizing:border-box;cursor:pointer;display:block;min-height:32px;user-select:none;-webkit-user-select:none;}.select2-container .selection .multiple-select .rendered-selection{display:block;overflow:hidden;padding-left:8px;text-overflow:ellipsis;}.select2-container .dropdown{background-color:white;border:1px solid #aaa;border-radius:4px;box-sizing:border-box;display:block;position:absolute;left:-100000px;width:100%;z-index:100;}.select2-container .dropdown .search{display:block;padding:4px;}.select2-container .dropdown .search input{outline:0;padding:4px;width:100%;}.select2-container .dropdown .results{display:block;}.select2-container .dropdown .results .options{list-style:none;margin:0;padding:0;}.select2-container .dropdown .results .options .option{padding:6px;user-select:none;-webkit-user-select:none;}.select2-container .dropdown .results .options .option[aria-selected]{cursor:pointer;}.select2-container.open .dropdown{border-top:none;border-top-left-radius:0;border-top-right-radius:0;left:0;}.select2-container.select2-theme-default .selection .single-select{background-color:#fff;border:1px solid #aaa;border-radius:4px;}.select2-container.select2-theme-default .selection .single-select .rendered-selection{color:#444;line-height:28px;}.select2-container.select2-theme-default .selection .single-select .rendered-selection .placeholder{color:#999;}.select2-container.select2-theme-default .selection .multiple-select{background-color:white;border:1px solid #aaa;border-radius:4px;}.select2-container.select2-theme-default .selection .multiple-select .rendered-selection{list-style:none;margin:0;padding:5px;padding-bottom:0;}.select2-container.select2-theme-default .selection .multiple-select .rendered-selection .placeholder{color:#999;float:left;}.select2-container.select2-theme-default .selection .multiple-select .rendered-selection .choice{background-color:#e4e4e4;border:1px solid #aaa;border-radius:4px;float:left;margin-right:5px;margin-bottom:5px;padding:0 5px;}.select2-container.select2-theme-default .selection .multiple-select .rendered-selection .choice .remove{color:#999;display:inline-block;font-weight:bold;margin-right:2px;}.select2-container.select2-theme-default .selection .multiple-select .rendered-selection .choice .remove:hover{color:#333;}.select2-container.select2-theme-default.open .selection .single-select,.select2-container.select2-theme-default.open .selection .multiple-select{border-bottom-left-radius:0;border-bottom-right-radius:0;}.select2-container.select2-theme-default .dropdown .search input{border:1px solid #aaa;}.select2-container.select2-theme-default .dropdown .results{max-height:200px;overflow-y:scroll;}.select2-container.select2-theme-default .dropdown .results .options .option.group{padding:0;}.select2-container.select2-theme-default .dropdown .results .options .option.group .group-label{cursor:default;display:block;padding:6px;}.select2-container.select2-theme-default .dropdown .results .options .option[aria-disabled=true]{color:#666;}.select2-container.select2-theme-default .dropdown .results .options .option[aria-selected=true]{background-color:#ddd;}.select2-container.select2-theme-default .dropdown .results .options .option[aria-selected].highlighted{background-color:#5897fb;color:white;}.s2-container{margin:0;position:relative;zoom:1;vertical-align:middle;}.s2-container.s2-active{border:1px solid #5897fb;border-top:bottom;}.s2-container .s2-single-select{display:block;height:26px;padding:0 0 0 8px;overflow:hidden;position:relative;border:1px solid #aaa;white-space:nowrap;line-height:26px;color:#444;text-decoration:none;border-radius:4px;background-clip:padding-box;-webkit-touch-callout:none;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none;background-color:#fff;background-image:-webkit-gradient(linear, left bottom, left top, color-stop(0, #eee), color-stop(0.5, #fff));background-image:-webkit-linear-gradient(center bottom, #eee 0%, #fff 50%);background-image:-moz-linear-gradient(center bottom, #eee 0%, #fff 50%);filter:progid:DXImageTransform.Microsoft.gradient(startColorstr = '#ffffff', endColorstr = '#eeeeee', GradientType = 0);background-image:linear-gradient(to top, #eee 0%, #fff 50%);}.s2-container .s2-single-select .s2-selection{margin-right:26px;display:block;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;}.s2-container .s2-open .select2-container-active .select2-choice,.s2-container .s2-open .select2-container-active .select2-choices{border:1px solid #5897fb;outline:none;-webkit-box-shadow:0 0 5px rgba(0, 0, 0, 0.3);box-shadow:0 0 5px rgba(0, 0, 0, 0.3);}.s2-search input{-webkit-box-sizing:border-box;-moz-box-sizing:border-box;box-sizing:border-box;}.s2-dropdown{width:100%;margin-top:-1px;position:absolute;z-index:9999;overflow:scroll;background:#fff;color:#000;border:1px solid #5897fb;border-top:none;border-radius:0 0 4px 4px;-webkit-box-shadow:0 4px 5px rgba(0, 0, 0, 0.15);box-shadow:0 4px 5px rgba(0, 0, 0, 0.15);}.s2-hidden{display:none;}
\ No newline at end of file
diff --git a/dist/js/select2.amd.full.js b/dist/js/select2.amd.full.js
index 8a9a6c2c..7f966006 100644
--- a/dist/js/select2.amd.full.js
+++ b/dist/js/select2.amd.full.js
@@ -151,7 +151,7 @@ define('select2/results',[
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="options"></ul>'
+      '<ul class="options" role="listbox"></ul>'
     );
 
     this.$results = $results;
@@ -191,28 +191,42 @@ define('select2/results',[
         return s.id.toString();
       });
 
-      self.$results.find('.option.selected').removeClass('selected');
-
-      var $options = self.$results.find('.option');
+      var $options = self.$results.find('.option[aria-selected]');
 
       $options.each(function () {
         var $option = $(this);
         var item = $option.data('data');
 
         if (item.id != null && selectedIds.indexOf(item.id.toString()) > -1) {
-          $option.addClass('selected');
+          $option.attr('aria-selected', 'true');
+        } else {
+          $option.attr('aria-selected', 'false');
         }
       });
+
+      var $selected = $options.filter('[aria-selected=true]');
+
+      // Check if there are any selected options
+      if ($selected.length > 0) {
+        // If there are selected options, highlight the first
+        $selected.first().trigger('mouseenter');
+      } else {
+        // If there are no selected options, highlight the first option
+        // in the dropdown
+        $options.first().trigger('mouseenter');
+      }
     });
   };
 
   Results.prototype.option = function (data) {
     var $option = $(
-      '<li class="option highlightable selectable"></li>'
+      '<li class="option" role="option" aria-selected="false"></li>'
     );
 
     if (data.children) {
-      $option.addClass('group').removeClass('highlightable selectable');
+      $option
+        .addClass('group')
+        .removeAttr('aria-selected');
 
       var $label = $('<strong class="group-label"></strong>');
       $label.html(data.text);
@@ -238,11 +252,13 @@ define('select2/results',[
     }
 
     if (data.disabled) {
-      $option.removeClass('selectable highlightable').addClass('disabled');
+      $option
+        .removeAttr('aria-selected')
+        .attr('aria-disabled', 'true');
     }
 
     if (data.id == null) {
-      $option.removeClass('selectable highlightable');
+      $option.removeClass('aria-selected');
     }
 
     $option.data('data', data);
@@ -274,11 +290,40 @@ define('select2/results',[
       self.setClasses();
     });
 
-    this.$results.on('mouseup', '.option.selectable', function (evt) {
+    container.on('open', function () {
+      // When the dropdown is open, aria-expended="true"
+      self.$results.attr('aria-expanded', 'true');
+
+      self.setClasses();
+    });
+
+    container.on('close', function () {
+      // When the dropdown is closed, aria-expended="false"
+      self.$results.attr('aria-expanded', 'false');
+    });
+
+    container.on('results:select', function () {
+      var $highlighted = self.$results.find('.highlighted');
+
+      var data = $highlighted.data('data');
+
+      if ($highlighted.attr('aria-selected') == 'true') {
+        self.trigger('unselected', {
+          data: data
+        });
+      } else {
+        self.trigger('selected', {
+          data: data
+        });
+      }
+    });
+
+    this.$results.on('mouseup', '.option[aria-selected]', function (evt) {
       var $this = $(this);
 
       var data = $this.data('data');
-      if ($this.hasClass('selected')) {
+
+      if ($this.attr('aria-selected') === 'true') {
         self.trigger('unselected', {
           originalEvent: evt,
           data: data
@@ -293,7 +338,7 @@ define('select2/results',[
       });
     });
 
-    this.$results.on('mouseenter', '.option.highlightable', function (evt) {
+    this.$results.on('mouseenter', '.option[aria-selected]', function (evt) {
       self.$results.find('.option.highlighted').removeClass('highlighted');
       $(this).addClass('highlighted');
     });
@@ -337,10 +382,51 @@ define('select2/selection/base',[
   return BaseSelection;
 });
 
+define('select2/keys',[
+
+], function () {
+  var KEYS = {
+    BACKSPACE: 8,
+    TAB: 9,
+    ENTER: 13,
+    SHIFT: 16,
+    CTRL: 17,
+    ALT: 18,
+    ESC: 27,
+    SPACE: 32,
+    PAGE_UP: 33,
+    PAGE_DOWN: 34,
+    END: 35,
+    HOME: 36,
+    LEFT: 37,
+    UP: 38,
+    RIGHT: 39,
+    DOWN: 40,
+    DELETE: 46,
+
+    isArrow: function (k) {
+        k = k.which ? k.which : k;
+
+        switch (k) {
+        case KEY.LEFT:
+        case KEY.RIGHT:
+        case KEY.UP:
+        case KEY.DOWN:
+            return true;
+        }
+
+        return false;
+    }
+  };
+
+  return KEYS;
+});
+
 define('select2/selection/single',[
   './base',
-  '../utils'
-], function (BaseSelection, Utils) {
+  '../utils',
+  '../keys'
+], function (BaseSelection, Utils, KEYS) {
   function SingleSelection () {
     SingleSelection.__super__.constructor.apply(this, arguments);
   }
@@ -349,11 +435,13 @@ define('select2/selection/single',[
 
   SingleSelection.prototype.render = function () {
     var $selection = $(
-      '<span class="single-select">' +
+      '<span class="single-select" tabindex="0">' +
         '<span class="rendered-selection"></span>' +
       '</span>'
     );
 
+    $selection.attr('title', this.$element.attr('title'));
+
     this.$selection = $selection;
 
     return $selection;
@@ -375,6 +463,28 @@ define('select2/selection/single',[
       });
     });
 
+    this.$selection.on('focus', function (evt) {
+      // User focuses on the container
+    });
+
+    this.$selection.on('blur', function (evt) {
+      // User exits the container
+    });
+
+    this.$selection.on('keyup', function (evt) {
+      var key = evt.which;
+
+      if (container.isOpen()) {
+        if (key == KEYS.ENTER) {
+          self.trigger('results:select');
+        }
+      } else {
+        if (key == KEYS.ENTER || key == KEYS.SPACE) {
+          self.trigger('open');
+        }
+      }
+    });
+
     container.on('selection:update', function (params) {
       self.update(params.data);
     });
@@ -468,7 +578,7 @@ define('select2/selection/multiple',[
   MultipleSelection.prototype.selectionContainer = function () {
     var $container = $(
       '<li class="choice">' +
-        '<span class="remove">&times;</span>' +
+        '<span class="remove" role="presentation">&times;</span>' +
       '</li>'
     );
 
@@ -898,7 +1008,7 @@ define('select2/dropdown/search',[
 
     var $search = $(
       '<span class="search">' +
-        '<input type="search" name="search" />' +
+        '<input type="search" name="search" tabindex="-1" role="textbox" />' +
       '</span>'
     );
 
@@ -921,6 +1031,14 @@ define('select2/dropdown/search',[
       });
     });
 
+    container.on('open', function () {
+      self.$search.attr('tabindex', 0);
+    });
+
+    container.on('close', function () {
+      self.$search.attr('tabindex', -1);
+    });
+
     container.on('results:all', function (params) {
       if (params.query.term == null || params.query.term === '') {
         var showSearch = self.showSearch(params);
@@ -1108,10 +1226,20 @@ define('select2/core',[
       });
     });
 
+    this.selection.on('open', function () {
+      self.trigger('open');
+    });
+    this.selection.on('close', function () {
+      self.trigger('close');
+    });
     this.selection.on('toggle', function () {
       self.toggleDropdown();
     });
 
+    this.selection.on('results:select', function () {
+      self.trigger('results:select');
+    });
+
     this.selection.on('unselected', function (params) {
       self.trigger('unselect', params);
 
@@ -1160,18 +1288,23 @@ define('select2/core',[
     // Hide the original select
 
     $element.hide();
+    $element.attr('tabindex', '-1');
   };
 
   Utils.Extend(Select2, Utils.Observable);
 
   Select2.prototype.toggleDropdown = function () {
-    if (this.$container.hasClass('open')) {
+    if (this.isOpen()) {
       this.trigger('close');
     } else {
       this.trigger('open');
     }
   };
 
+  Select2.prototype.isOpen = function () {
+    return this.$container.hasClass('open');
+  };
+
   Select2.prototype.render = function () {
     var $container = $(
       '<span class="select2 select2-container select2-theme-default">' +
diff --git a/dist/js/select2.amd.js b/dist/js/select2.amd.js
index 8a9a6c2c..7f966006 100644
--- a/dist/js/select2.amd.js
+++ b/dist/js/select2.amd.js
@@ -151,7 +151,7 @@ define('select2/results',[
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="options"></ul>'
+      '<ul class="options" role="listbox"></ul>'
     );
 
     this.$results = $results;
@@ -191,28 +191,42 @@ define('select2/results',[
         return s.id.toString();
       });
 
-      self.$results.find('.option.selected').removeClass('selected');
-
-      var $options = self.$results.find('.option');
+      var $options = self.$results.find('.option[aria-selected]');
 
       $options.each(function () {
         var $option = $(this);
         var item = $option.data('data');
 
         if (item.id != null && selectedIds.indexOf(item.id.toString()) > -1) {
-          $option.addClass('selected');
+          $option.attr('aria-selected', 'true');
+        } else {
+          $option.attr('aria-selected', 'false');
         }
       });
+
+      var $selected = $options.filter('[aria-selected=true]');
+
+      // Check if there are any selected options
+      if ($selected.length > 0) {
+        // If there are selected options, highlight the first
+        $selected.first().trigger('mouseenter');
+      } else {
+        // If there are no selected options, highlight the first option
+        // in the dropdown
+        $options.first().trigger('mouseenter');
+      }
     });
   };
 
   Results.prototype.option = function (data) {
     var $option = $(
-      '<li class="option highlightable selectable"></li>'
+      '<li class="option" role="option" aria-selected="false"></li>'
     );
 
     if (data.children) {
-      $option.addClass('group').removeClass('highlightable selectable');
+      $option
+        .addClass('group')
+        .removeAttr('aria-selected');
 
       var $label = $('<strong class="group-label"></strong>');
       $label.html(data.text);
@@ -238,11 +252,13 @@ define('select2/results',[
     }
 
     if (data.disabled) {
-      $option.removeClass('selectable highlightable').addClass('disabled');
+      $option
+        .removeAttr('aria-selected')
+        .attr('aria-disabled', 'true');
     }
 
     if (data.id == null) {
-      $option.removeClass('selectable highlightable');
+      $option.removeClass('aria-selected');
     }
 
     $option.data('data', data);
@@ -274,11 +290,40 @@ define('select2/results',[
       self.setClasses();
     });
 
-    this.$results.on('mouseup', '.option.selectable', function (evt) {
+    container.on('open', function () {
+      // When the dropdown is open, aria-expended="true"
+      self.$results.attr('aria-expanded', 'true');
+
+      self.setClasses();
+    });
+
+    container.on('close', function () {
+      // When the dropdown is closed, aria-expended="false"
+      self.$results.attr('aria-expanded', 'false');
+    });
+
+    container.on('results:select', function () {
+      var $highlighted = self.$results.find('.highlighted');
+
+      var data = $highlighted.data('data');
+
+      if ($highlighted.attr('aria-selected') == 'true') {
+        self.trigger('unselected', {
+          data: data
+        });
+      } else {
+        self.trigger('selected', {
+          data: data
+        });
+      }
+    });
+
+    this.$results.on('mouseup', '.option[aria-selected]', function (evt) {
       var $this = $(this);
 
       var data = $this.data('data');
-      if ($this.hasClass('selected')) {
+
+      if ($this.attr('aria-selected') === 'true') {
         self.trigger('unselected', {
           originalEvent: evt,
           data: data
@@ -293,7 +338,7 @@ define('select2/results',[
       });
     });
 
-    this.$results.on('mouseenter', '.option.highlightable', function (evt) {
+    this.$results.on('mouseenter', '.option[aria-selected]', function (evt) {
       self.$results.find('.option.highlighted').removeClass('highlighted');
       $(this).addClass('highlighted');
     });
@@ -337,10 +382,51 @@ define('select2/selection/base',[
   return BaseSelection;
 });
 
+define('select2/keys',[
+
+], function () {
+  var KEYS = {
+    BACKSPACE: 8,
+    TAB: 9,
+    ENTER: 13,
+    SHIFT: 16,
+    CTRL: 17,
+    ALT: 18,
+    ESC: 27,
+    SPACE: 32,
+    PAGE_UP: 33,
+    PAGE_DOWN: 34,
+    END: 35,
+    HOME: 36,
+    LEFT: 37,
+    UP: 38,
+    RIGHT: 39,
+    DOWN: 40,
+    DELETE: 46,
+
+    isArrow: function (k) {
+        k = k.which ? k.which : k;
+
+        switch (k) {
+        case KEY.LEFT:
+        case KEY.RIGHT:
+        case KEY.UP:
+        case KEY.DOWN:
+            return true;
+        }
+
+        return false;
+    }
+  };
+
+  return KEYS;
+});
+
 define('select2/selection/single',[
   './base',
-  '../utils'
-], function (BaseSelection, Utils) {
+  '../utils',
+  '../keys'
+], function (BaseSelection, Utils, KEYS) {
   function SingleSelection () {
     SingleSelection.__super__.constructor.apply(this, arguments);
   }
@@ -349,11 +435,13 @@ define('select2/selection/single',[
 
   SingleSelection.prototype.render = function () {
     var $selection = $(
-      '<span class="single-select">' +
+      '<span class="single-select" tabindex="0">' +
         '<span class="rendered-selection"></span>' +
       '</span>'
     );
 
+    $selection.attr('title', this.$element.attr('title'));
+
     this.$selection = $selection;
 
     return $selection;
@@ -375,6 +463,28 @@ define('select2/selection/single',[
       });
     });
 
+    this.$selection.on('focus', function (evt) {
+      // User focuses on the container
+    });
+
+    this.$selection.on('blur', function (evt) {
+      // User exits the container
+    });
+
+    this.$selection.on('keyup', function (evt) {
+      var key = evt.which;
+
+      if (container.isOpen()) {
+        if (key == KEYS.ENTER) {
+          self.trigger('results:select');
+        }
+      } else {
+        if (key == KEYS.ENTER || key == KEYS.SPACE) {
+          self.trigger('open');
+        }
+      }
+    });
+
     container.on('selection:update', function (params) {
       self.update(params.data);
     });
@@ -468,7 +578,7 @@ define('select2/selection/multiple',[
   MultipleSelection.prototype.selectionContainer = function () {
     var $container = $(
       '<li class="choice">' +
-        '<span class="remove">&times;</span>' +
+        '<span class="remove" role="presentation">&times;</span>' +
       '</li>'
     );
 
@@ -898,7 +1008,7 @@ define('select2/dropdown/search',[
 
     var $search = $(
       '<span class="search">' +
-        '<input type="search" name="search" />' +
+        '<input type="search" name="search" tabindex="-1" role="textbox" />' +
       '</span>'
     );
 
@@ -921,6 +1031,14 @@ define('select2/dropdown/search',[
       });
     });
 
+    container.on('open', function () {
+      self.$search.attr('tabindex', 0);
+    });
+
+    container.on('close', function () {
+      self.$search.attr('tabindex', -1);
+    });
+
     container.on('results:all', function (params) {
       if (params.query.term == null || params.query.term === '') {
         var showSearch = self.showSearch(params);
@@ -1108,10 +1226,20 @@ define('select2/core',[
       });
     });
 
+    this.selection.on('open', function () {
+      self.trigger('open');
+    });
+    this.selection.on('close', function () {
+      self.trigger('close');
+    });
     this.selection.on('toggle', function () {
       self.toggleDropdown();
     });
 
+    this.selection.on('results:select', function () {
+      self.trigger('results:select');
+    });
+
     this.selection.on('unselected', function (params) {
       self.trigger('unselect', params);
 
@@ -1160,18 +1288,23 @@ define('select2/core',[
     // Hide the original select
 
     $element.hide();
+    $element.attr('tabindex', '-1');
   };
 
   Utils.Extend(Select2, Utils.Observable);
 
   Select2.prototype.toggleDropdown = function () {
-    if (this.$container.hasClass('open')) {
+    if (this.isOpen()) {
       this.trigger('close');
     } else {
       this.trigger('open');
     }
   };
 
+  Select2.prototype.isOpen = function () {
+    return this.$container.hasClass('open');
+  };
+
   Select2.prototype.render = function () {
     var $container = $(
       '<span class="select2 select2-container select2-theme-default">' +
diff --git a/dist/js/select2.full.js b/dist/js/select2.full.js
index 64e1c8e3..907187e2 100644
--- a/dist/js/select2.full.js
+++ b/dist/js/select2.full.js
@@ -9689,7 +9689,7 @@ define('select2/results',[
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="options"></ul>'
+      '<ul class="options" role="listbox"></ul>'
     );
 
     this.$results = $results;
@@ -9729,28 +9729,42 @@ define('select2/results',[
         return s.id.toString();
       });
 
-      self.$results.find('.option.selected').removeClass('selected');
-
-      var $options = self.$results.find('.option');
+      var $options = self.$results.find('.option[aria-selected]');
 
       $options.each(function () {
         var $option = $(this);
         var item = $option.data('data');
 
         if (item.id != null && selectedIds.indexOf(item.id.toString()) > -1) {
-          $option.addClass('selected');
+          $option.attr('aria-selected', 'true');
+        } else {
+          $option.attr('aria-selected', 'false');
         }
       });
+
+      var $selected = $options.filter('[aria-selected=true]');
+
+      // Check if there are any selected options
+      if ($selected.length > 0) {
+        // If there are selected options, highlight the first
+        $selected.first().trigger('mouseenter');
+      } else {
+        // If there are no selected options, highlight the first option
+        // in the dropdown
+        $options.first().trigger('mouseenter');
+      }
     });
   };
 
   Results.prototype.option = function (data) {
     var $option = $(
-      '<li class="option highlightable selectable"></li>'
+      '<li class="option" role="option" aria-selected="false"></li>'
     );
 
     if (data.children) {
-      $option.addClass('group').removeClass('highlightable selectable');
+      $option
+        .addClass('group')
+        .removeAttr('aria-selected');
 
       var $label = $('<strong class="group-label"></strong>');
       $label.html(data.text);
@@ -9776,11 +9790,13 @@ define('select2/results',[
     }
 
     if (data.disabled) {
-      $option.removeClass('selectable highlightable').addClass('disabled');
+      $option
+        .removeAttr('aria-selected')
+        .attr('aria-disabled', 'true');
     }
 
     if (data.id == null) {
-      $option.removeClass('selectable highlightable');
+      $option.removeClass('aria-selected');
     }
 
     $option.data('data', data);
@@ -9812,11 +9828,40 @@ define('select2/results',[
       self.setClasses();
     });
 
-    this.$results.on('mouseup', '.option.selectable', function (evt) {
+    container.on('open', function () {
+      // When the dropdown is open, aria-expended="true"
+      self.$results.attr('aria-expanded', 'true');
+
+      self.setClasses();
+    });
+
+    container.on('close', function () {
+      // When the dropdown is closed, aria-expended="false"
+      self.$results.attr('aria-expanded', 'false');
+    });
+
+    container.on('results:select', function () {
+      var $highlighted = self.$results.find('.highlighted');
+
+      var data = $highlighted.data('data');
+
+      if ($highlighted.attr('aria-selected') == 'true') {
+        self.trigger('unselected', {
+          data: data
+        });
+      } else {
+        self.trigger('selected', {
+          data: data
+        });
+      }
+    });
+
+    this.$results.on('mouseup', '.option[aria-selected]', function (evt) {
       var $this = $(this);
 
       var data = $this.data('data');
-      if ($this.hasClass('selected')) {
+
+      if ($this.attr('aria-selected') === 'true') {
         self.trigger('unselected', {
           originalEvent: evt,
           data: data
@@ -9831,7 +9876,7 @@ define('select2/results',[
       });
     });
 
-    this.$results.on('mouseenter', '.option.highlightable', function (evt) {
+    this.$results.on('mouseenter', '.option[aria-selected]', function (evt) {
       self.$results.find('.option.highlighted').removeClass('highlighted');
       $(this).addClass('highlighted');
     });
@@ -9875,10 +9920,51 @@ define('select2/selection/base',[
   return BaseSelection;
 });
 
+define('select2/keys',[
+
+], function () {
+  var KEYS = {
+    BACKSPACE: 8,
+    TAB: 9,
+    ENTER: 13,
+    SHIFT: 16,
+    CTRL: 17,
+    ALT: 18,
+    ESC: 27,
+    SPACE: 32,
+    PAGE_UP: 33,
+    PAGE_DOWN: 34,
+    END: 35,
+    HOME: 36,
+    LEFT: 37,
+    UP: 38,
+    RIGHT: 39,
+    DOWN: 40,
+    DELETE: 46,
+
+    isArrow: function (k) {
+        k = k.which ? k.which : k;
+
+        switch (k) {
+        case KEY.LEFT:
+        case KEY.RIGHT:
+        case KEY.UP:
+        case KEY.DOWN:
+            return true;
+        }
+
+        return false;
+    }
+  };
+
+  return KEYS;
+});
+
 define('select2/selection/single',[
   './base',
-  '../utils'
-], function (BaseSelection, Utils) {
+  '../utils',
+  '../keys'
+], function (BaseSelection, Utils, KEYS) {
   function SingleSelection () {
     SingleSelection.__super__.constructor.apply(this, arguments);
   }
@@ -9887,11 +9973,13 @@ define('select2/selection/single',[
 
   SingleSelection.prototype.render = function () {
     var $selection = $(
-      '<span class="single-select">' +
+      '<span class="single-select" tabindex="0">' +
         '<span class="rendered-selection"></span>' +
       '</span>'
     );
 
+    $selection.attr('title', this.$element.attr('title'));
+
     this.$selection = $selection;
 
     return $selection;
@@ -9913,6 +10001,28 @@ define('select2/selection/single',[
       });
     });
 
+    this.$selection.on('focus', function (evt) {
+      // User focuses on the container
+    });
+
+    this.$selection.on('blur', function (evt) {
+      // User exits the container
+    });
+
+    this.$selection.on('keyup', function (evt) {
+      var key = evt.which;
+
+      if (container.isOpen()) {
+        if (key == KEYS.ENTER) {
+          self.trigger('results:select');
+        }
+      } else {
+        if (key == KEYS.ENTER || key == KEYS.SPACE) {
+          self.trigger('open');
+        }
+      }
+    });
+
     container.on('selection:update', function (params) {
       self.update(params.data);
     });
@@ -10006,7 +10116,7 @@ define('select2/selection/multiple',[
   MultipleSelection.prototype.selectionContainer = function () {
     var $container = $(
       '<li class="choice">' +
-        '<span class="remove">&times;</span>' +
+        '<span class="remove" role="presentation">&times;</span>' +
       '</li>'
     );
 
@@ -10436,7 +10546,7 @@ define('select2/dropdown/search',[
 
     var $search = $(
       '<span class="search">' +
-        '<input type="search" name="search" />' +
+        '<input type="search" name="search" tabindex="-1" role="textbox" />' +
       '</span>'
     );
 
@@ -10459,6 +10569,14 @@ define('select2/dropdown/search',[
       });
     });
 
+    container.on('open', function () {
+      self.$search.attr('tabindex', 0);
+    });
+
+    container.on('close', function () {
+      self.$search.attr('tabindex', -1);
+    });
+
     container.on('results:all', function (params) {
       if (params.query.term == null || params.query.term === '') {
         var showSearch = self.showSearch(params);
@@ -10646,10 +10764,20 @@ define('select2/core',[
       });
     });
 
+    this.selection.on('open', function () {
+      self.trigger('open');
+    });
+    this.selection.on('close', function () {
+      self.trigger('close');
+    });
     this.selection.on('toggle', function () {
       self.toggleDropdown();
     });
 
+    this.selection.on('results:select', function () {
+      self.trigger('results:select');
+    });
+
     this.selection.on('unselected', function (params) {
       self.trigger('unselect', params);
 
@@ -10698,18 +10826,23 @@ define('select2/core',[
     // Hide the original select
 
     $element.hide();
+    $element.attr('tabindex', '-1');
   };
 
   Utils.Extend(Select2, Utils.Observable);
 
   Select2.prototype.toggleDropdown = function () {
-    if (this.$container.hasClass('open')) {
+    if (this.isOpen()) {
       this.trigger('close');
     } else {
       this.trigger('open');
     }
   };
 
+  Select2.prototype.isOpen = function () {
+    return this.$container.hasClass('open');
+  };
+
   Select2.prototype.render = function () {
     var $container = $(
       '<span class="select2 select2-container select2-theme-default">' +
diff --git a/dist/js/select2.full.min.js b/dist/js/select2.full.min.js
index 127f5bdc..55dfd2b7 100644
--- a/dist/js/select2.full.min.js
+++ b/dist/js/select2.full.min.js
@@ -1,4 +1,4 @@
 var requirejs,require,define;!function(a){function b(a,b){return r.call(a,b)}function c(a,b){var c,d,e,f,g,h,i,j,k,l,m,n=b&&b.split("/"),o=p.map,q=o&&o["*"]||{};if(a&&"."===a.charAt(0))if(b){for(n=n.slice(0,n.length-1),a=a.split("/"),g=a.length-1,p.nodeIdCompat&&t.test(a[g])&&(a[g]=a[g].replace(t,"")),a=n.concat(a),k=0;k<a.length;k+=1)if(m=a[k],"."===m)a.splice(k,1),k-=1;else if(".."===m){if(1===k&&(".."===a[2]||".."===a[0]))break;k>0&&(a.splice(k-1,2),k-=2)}a=a.join("/")}else 0===a.indexOf("./")&&(a=a.substring(2));if((n||q)&&o){for(c=a.split("/"),k=c.length;k>0;k-=1){if(d=c.slice(0,k).join("/"),n)for(l=n.length;l>0;l-=1)if(e=o[n.slice(0,l).join("/")],e&&(e=e[d])){f=e,h=k;break}if(f)break;!i&&q&&q[d]&&(i=q[d],j=k)}!f&&i&&(f=i,h=j),f&&(c.splice(0,h,f),a=c.join("/"))}return a}function d(b,c){return function(){return k.apply(a,s.call(arguments,0).concat([b,c]))}}function e(a){return function(b){return c(b,a)}}function f(a){return function(b){n[a]=b}}function g(c){if(b(o,c)){var 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b=[],d=this;this.$element.find(":selected").each(function(){var a=c(this),e=d.item(a);b.push(e)}),a(b)},d.prototype.select=function(a){var b=this;if(this.$element.prop("multiple"))this.current(function(c){var d=[];a=[a],a.push.apply(a,c);for(var e=0;e<a.length;e++)id=a[e].id,-1===d.indexOf(id)&&d.push(id);b.$element.val(d),b.$element.trigger("change")});else{var c=a.id;this.$element.val(c),this.$element.trigger("change")}},d.prototype.unselect=function(a){var b=this;this.$element.prop("multiple")&&this.current(function(c){for(var d=[],e=0;e<c.length;e++)id=c[e].id,id!==a.id&&-1===d.indexOf(id)&&d.push(id);b.$element.val(d),b.$element.trigger("change")})},d.prototype.bind=function(a){var b=this;a.on("select",function(a){b.select(a.data)}),a.on("unselect",function(a){b.unselect(a.data)})},d.prototype.query=function(a,b){var d=[],e=this,f=this.$element.children();
+f.each(function(){var b=c(this);if(b.is("option")||b.is("optgroup")){var f=e.item(b),g=e.matches(a,f);null!==g&&d.push(g)}}),b(d)},d.prototype.item=function(a){var b=a.data("data");if(null==b){if(a.is("option"))b={id:a.val(),text:a.html(),disabled:a.prop("disabled")};else if(a.is("optgroup")){b={text:a.attr("label"),children:[]};for(var d=a.children("option"),e=[],f=0;f<d.length;f++){var g=c(d[f]),h=this.item(g);e.push(h)}b.children=e}a.data("data",b)}return b},d.prototype.matches=function(a,b){var d=c.extend(!0,{},b);if(b.children){for(var e=b.children.length-1;e>=0;e--){var f=b.children[e],g=this.matches(a,f);null===g&&d.children.splice(e,1)}if(d.children.length>0)return d}return""===c.trim(a.term)?d:b.text.toUpperCase().indexOf(a.term.toUpperCase())>-1?d:null},d}),define("select2/data/array",["./select","../utils"],function(a,b){function c(a,b){this.data=b.options.data,c.__super__.constructor.call(this,a,b)}return b.Extend(c,a),c.prototype.select=function(a){var b=this;this.$element.find("option").each(function(){var c=$(this),d=b.item(c);d.id==a.id.toString()&&c.remove()});var d=this.option(a);this.$element.append(d),c.__super__.select.call(this,a)},c.prototype.option=function(a){var b=$("<option></option>");return b.text(a.text),b.val(a.id),b.data("data",a),b},c.prototype.query=function(a,b){var c=[],d=this;$.each(this.data,function(){var b=this;d.matches(a,b)&&c.push(b)}),b(c)},c}),define("select2/data/ajax",["./array","../utils","jquery"],function(a,b,c){function d(b,c){this.ajaxOptions=c.get("ajax"),this.processResults=this.ajaxOptions.processResults||function(a){return a},a.__super__.constructor.call(this,b,c)}return b.Extend(d,a),d.prototype.query=function(a,b){var d=this,e=c.extend({type:"GET"},this.ajaxOptions);"function"==typeof e.url&&(e.url=e.url(a)),"function"==typeof e.data&&(e.data=e.data(a));var f=c.ajax(e);f.success(function(a){var c=d.processResults(a);b(c)})},d}),define("select2/dropdown",["./utils"],function(a){function b(a){this.$element=a}return a.Extend(b,a.Observable),b.prototype.render=function(){var a=$('<span class="dropdown"><span class="results"></span></span>');return a},b.prototype.bind=function(){},b}),define("select2/dropdown/search",[],function(){function a(){}return a.prototype.render=function(a){var b=a.call(this),c=$('<span class="search"><input type="search" name="search" tabindex="-1" role="textbox" /></span>');return this.$searchContainer=c,this.$search=c.find("input"),b.prepend(c),b},a.prototype.bind=function(a,b,c){var d=this;a.call(this,b,c),this.$search.on("keyup",function(){b.trigger("query",{term:$(this).val()})}),b.on("open",function(){d.$search.attr("tabindex",0)}),b.on("close",function(){d.$search.attr("tabindex",-1)}),b.on("results:all",function(a){if(null==a.query.term||""===a.query.term){var b=d.showSearch(a);b?d.$searchContainer.show():d.$searchContainer.hide()}})},a.prototype.showSearch=function(){return!0},a}),define("select2/defaults",["./results","./selection/single","./selection/multiple","./selection/placeholder","./utils","./data/select","./data/array","./data/ajax","./dropdown","./dropdown/search"],function(a,b,c,d,e,f,g,h,i,j){function k(){this.reset()}k.prototype.apply=function(k){if(k=$.extend({},k,this.defaults),null==k.dataAdapter&&(k.dataAdapter=k.ajax?h:k.data?g:f),null==k.resultsAdapter&&(k.resultsAdapter=a),null==k.dropdownAdapter){var l=e.Decorate(i,j);k.dropdownAdapter=l}return null==k.selectionAdapter&&(k.selectionAdapter=k.multiple?c:b,null!=k.placeholder&&(k.selectionAdapter=e.Decorate(k.selectionAdapter,d))),k},k.prototype.reset=function(){this.defaults={}};var l=new k;return l}),define("select2/options",["./defaults"],function(a){function b(b){this.options=a.apply(b)}return b.prototype.fromElement=function(){return this},b.prototype.get=function(a){return this.options[a]},b.prototype.set=function(a,b){this.options[a]=b},b}),define("select2/core",["jquery","./options","./utils"],function(a,b,c){var d=function(a,c){this.$element=a,c=c||{},c.multiple=c.multiple||a.prop("multiple"),this.options=new b(c),d.__super__.constructor.call(this);var e=this.options.get("dataAdapter");this.data=new e(a,this.options);var f=this.render();this.$container=f,f.insertAfter(this.$element),f.width(a.outerWidth(!1));var g=this.options.get("selectionAdapter");this.selection=new g(a,this.options);var h=f.find(".selection"),i=this.selection.render();h.append(i);var j=this.options.get("dropdownAdapter");this.dropdown=new j(a,this.options);var k=f.find(".dropdown-wrapper"),l=this.dropdown.render();k.append(l);var m=this.options.get("resultsAdapter");this.results=new m(a,this.options,this.data);var n=l.find(".results"),o=this.results.render();n.append(o);var p=this;this.data.bind(this,f),this.selection.bind(this,f),this.dropdown.bind(this,f),this.results.bind(this,f),this.$element.on("change",function(){p.data.current(function(a){p.trigger("selection:update",{data:a})})}),this.selection.on("open",function(){p.trigger("open")}),this.selection.on("close",function(){p.trigger("close")}),this.selection.on("toggle",function(){p.toggleDropdown()}),this.selection.on("results:select",function(){p.trigger("results:select")}),this.selection.on("unselected",function(a){p.trigger("unselect",a),p.trigger("close")}),this.results.on("selected",function(a){p.trigger("select",a),p.trigger("close")}),this.results.on("unselected",function(a){p.trigger("unselect",a),p.trigger("close")}),this.on("open",function(){f.addClass("open")}),this.on("close",function(){f.removeClass("open")}),this.data.current(function(a){p.trigger("selection:update",{data:a})}),this.on("query",function(a){this.data.query(a,function(b){p.trigger("results:all",{data:b,query:a})})}),this.trigger("query",{}),a.hide(),a.attr("tabindex","-1")};return c.Extend(d,c.Observable),d.prototype.toggleDropdown=function(){this.trigger(this.isOpen()?"close":"open")},d.prototype.isOpen=function(){return this.$container.hasClass("open")},d.prototype.render=function(){var b=a('<span class="select2 select2-container select2-theme-default"><span class="selection"></span><span class="dropdown-wrapper"></span></span>');return b},d}),define("jquery.select2",["jquery","select2/core"],function(a,b){return null==a.fn.select2&&(a.fn.select2=function(c){if(c=c||{},"object"==typeof c)this.each(function(){new b(a(this),c)});else{if("string"!=typeof c)throw new Error("Invalid arguments for Select2: "+c);var d=this.data("select2");d[c](arguments.slice(1))}}),b}),require("jquery.select2");
\ No newline at end of file
diff --git a/dist/js/select2.js b/dist/js/select2.js
index f26fbe66..8e028cfb 100644
--- a/dist/js/select2.js
+++ b/dist/js/select2.js
@@ -580,7 +580,7 @@ define('select2/results',[
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="options"></ul>'
+      '<ul class="options" role="listbox"></ul>'
     );
 
     this.$results = $results;
@@ -620,28 +620,42 @@ define('select2/results',[
         return s.id.toString();
       });
 
-      self.$results.find('.option.selected').removeClass('selected');
-
-      var $options = self.$results.find('.option');
+      var $options = self.$results.find('.option[aria-selected]');
 
       $options.each(function () {
         var $option = $(this);
         var item = $option.data('data');
 
         if (item.id != null && selectedIds.indexOf(item.id.toString()) > -1) {
-          $option.addClass('selected');
+          $option.attr('aria-selected', 'true');
+        } else {
+          $option.attr('aria-selected', 'false');
         }
       });
+
+      var $selected = $options.filter('[aria-selected=true]');
+
+      // Check if there are any selected options
+      if ($selected.length > 0) {
+        // If there are selected options, highlight the first
+        $selected.first().trigger('mouseenter');
+      } else {
+        // If there are no selected options, highlight the first option
+        // in the dropdown
+        $options.first().trigger('mouseenter');
+      }
     });
   };
 
   Results.prototype.option = function (data) {
     var $option = $(
-      '<li class="option highlightable selectable"></li>'
+      '<li class="option" role="option" aria-selected="false"></li>'
     );
 
     if (data.children) {
-      $option.addClass('group').removeClass('highlightable selectable');
+      $option
+        .addClass('group')
+        .removeAttr('aria-selected');
 
       var $label = $('<strong class="group-label"></strong>');
       $label.html(data.text);
@@ -667,11 +681,13 @@ define('select2/results',[
     }
 
     if (data.disabled) {
-      $option.removeClass('selectable highlightable').addClass('disabled');
+      $option
+        .removeAttr('aria-selected')
+        .attr('aria-disabled', 'true');
     }
 
     if (data.id == null) {
-      $option.removeClass('selectable highlightable');
+      $option.removeClass('aria-selected');
     }
 
     $option.data('data', data);
@@ -703,11 +719,40 @@ define('select2/results',[
       self.setClasses();
     });
 
-    this.$results.on('mouseup', '.option.selectable', function (evt) {
+    container.on('open', function () {
+      // When the dropdown is open, aria-expended="true"
+      self.$results.attr('aria-expanded', 'true');
+
+      self.setClasses();
+    });
+
+    container.on('close', function () {
+      // When the dropdown is closed, aria-expended="false"
+      self.$results.attr('aria-expanded', 'false');
+    });
+
+    container.on('results:select', function () {
+      var $highlighted = self.$results.find('.highlighted');
+
+      var data = $highlighted.data('data');
+
+      if ($highlighted.attr('aria-selected') == 'true') {
+        self.trigger('unselected', {
+          data: data
+        });
+      } else {
+        self.trigger('selected', {
+          data: data
+        });
+      }
+    });
+
+    this.$results.on('mouseup', '.option[aria-selected]', function (evt) {
       var $this = $(this);
 
       var data = $this.data('data');
-      if ($this.hasClass('selected')) {
+
+      if ($this.attr('aria-selected') === 'true') {
         self.trigger('unselected', {
           originalEvent: evt,
           data: data
@@ -722,7 +767,7 @@ define('select2/results',[
       });
     });
 
-    this.$results.on('mouseenter', '.option.highlightable', function (evt) {
+    this.$results.on('mouseenter', '.option[aria-selected]', function (evt) {
       self.$results.find('.option.highlighted').removeClass('highlighted');
       $(this).addClass('highlighted');
     });
@@ -766,10 +811,51 @@ define('select2/selection/base',[
   return BaseSelection;
 });
 
+define('select2/keys',[
+
+], function () {
+  var KEYS = {
+    BACKSPACE: 8,
+    TAB: 9,
+    ENTER: 13,
+    SHIFT: 16,
+    CTRL: 17,
+    ALT: 18,
+    ESC: 27,
+    SPACE: 32,
+    PAGE_UP: 33,
+    PAGE_DOWN: 34,
+    END: 35,
+    HOME: 36,
+    LEFT: 37,
+    UP: 38,
+    RIGHT: 39,
+    DOWN: 40,
+    DELETE: 46,
+
+    isArrow: function (k) {
+        k = k.which ? k.which : k;
+
+        switch (k) {
+        case KEY.LEFT:
+        case KEY.RIGHT:
+        case KEY.UP:
+        case KEY.DOWN:
+            return true;
+        }
+
+        return false;
+    }
+  };
+
+  return KEYS;
+});
+
 define('select2/selection/single',[
   './base',
-  '../utils'
-], function (BaseSelection, Utils) {
+  '../utils',
+  '../keys'
+], function (BaseSelection, Utils, KEYS) {
   function SingleSelection () {
     SingleSelection.__super__.constructor.apply(this, arguments);
   }
@@ -778,11 +864,13 @@ define('select2/selection/single',[
 
   SingleSelection.prototype.render = function () {
     var $selection = $(
-      '<span class="single-select">' +
+      '<span class="single-select" tabindex="0">' +
         '<span class="rendered-selection"></span>' +
       '</span>'
     );
 
+    $selection.attr('title', this.$element.attr('title'));
+
     this.$selection = $selection;
 
     return $selection;
@@ -804,6 +892,28 @@ define('select2/selection/single',[
       });
     });
 
+    this.$selection.on('focus', function (evt) {
+      // User focuses on the container
+    });
+
+    this.$selection.on('blur', function (evt) {
+      // User exits the container
+    });
+
+    this.$selection.on('keyup', function (evt) {
+      var key = evt.which;
+
+      if (container.isOpen()) {
+        if (key == KEYS.ENTER) {
+          self.trigger('results:select');
+        }
+      } else {
+        if (key == KEYS.ENTER || key == KEYS.SPACE) {
+          self.trigger('open');
+        }
+      }
+    });
+
     container.on('selection:update', function (params) {
       self.update(params.data);
     });
@@ -897,7 +1007,7 @@ define('select2/selection/multiple',[
   MultipleSelection.prototype.selectionContainer = function () {
     var $container = $(
       '<li class="choice">' +
-        '<span class="remove">&times;</span>' +
+        '<span class="remove" role="presentation">&times;</span>' +
       '</li>'
     );
 
@@ -1327,7 +1437,7 @@ define('select2/dropdown/search',[
 
     var $search = $(
       '<span class="search">' +
-        '<input type="search" name="search" />' +
+        '<input type="search" name="search" tabindex="-1" role="textbox" />' +
       '</span>'
     );
 
@@ -1350,6 +1460,14 @@ define('select2/dropdown/search',[
       });
     });
 
+    container.on('open', function () {
+      self.$search.attr('tabindex', 0);
+    });
+
+    container.on('close', function () {
+      self.$search.attr('tabindex', -1);
+    });
+
     container.on('results:all', function (params) {
       if (params.query.term == null || params.query.term === '') {
         var showSearch = self.showSearch(params);
@@ -1537,10 +1655,20 @@ define('select2/core',[
       });
     });
 
+    this.selection.on('open', function () {
+      self.trigger('open');
+    });
+    this.selection.on('close', function () {
+      self.trigger('close');
+    });
     this.selection.on('toggle', function () {
       self.toggleDropdown();
     });
 
+    this.selection.on('results:select', function () {
+      self.trigger('results:select');
+    });
+
     this.selection.on('unselected', function (params) {
       self.trigger('unselect', params);
 
@@ -1589,18 +1717,23 @@ define('select2/core',[
     // Hide the original select
 
     $element.hide();
+    $element.attr('tabindex', '-1');
   };
 
   Utils.Extend(Select2, Utils.Observable);
 
   Select2.prototype.toggleDropdown = function () {
-    if (this.$container.hasClass('open')) {
+    if (this.isOpen()) {
       this.trigger('close');
     } else {
       this.trigger('open');
     }
   };
 
+  Select2.prototype.isOpen = function () {
+    return this.$container.hasClass('open');
+  };
+
   Select2.prototype.render = function () {
     var $container = $(
       '<span class="select2 select2-container select2-theme-default">' +
diff --git a/dist/js/select2.min.js b/dist/js/select2.min.js
index f0d72789..bc56f3a9 100644
--- a/dist/js/select2.min.js
+++ b/dist/js/select2.min.js
@@ -1 +1 @@
-var requirejs,require,define;!function(a){function b(a,b){return r.call(a,b)}function c(a,b){var c,d,e,f,g,h,i,j,k,l,m,n=b&&b.split("/"),o=p.map,q=o&&o["*"]||{};if(a&&"."===a.charAt(0))if(b){for(n=n.slice(0,n.length-1),a=a.split("/"),g=a.length-1,p.nodeIdCompat&&t.test(a[g])&&(a[g]=a[g].replace(t,"")),a=n.concat(a),k=0;k<a.length;k+=1)if(m=a[k],"."===m)a.splice(k,1),k-=1;else if(".."===m){if(1===k&&(".."===a[2]||".."===a[0]))break;k>0&&(a.splice(k-1,2),k-=2)}a=a.join("/")}else 0===a.indexOf("./")&&(a=a.substring(2));if((n||q)&&o){for(c=a.split("/"),k=c.length;k>0;k-=1){if(d=c.slice(0,k).join("/"),n)for(l=n.length;l>0;l-=1)if(e=o[n.slice(0,l).join("/")],e&&(e=e[d])){f=e,h=k;break}if(f)break;!i&&q&&q[d]&&(i=q[d],j=k)}!f&&i&&(f=i,h=j),f&&(c.splice(0,h,f),a=c.join("/"))}return a}function d(b,c){return function(){return k.apply(a,s.call(arguments,0).concat([b,c]))}}function e(a){return function(b){return c(b,a)}}function f(a){return function(b){n[a]=b}}function g(c){if(b(o,c)){var 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this.listeners?this.listeners[a].push(b):this.listeners[a]=[b]},c.prototype.trigger=function(a){var b=Array.prototype.slice;a in this.listeners&&this.invoke(this.listeners[a],b.call(arguments,1)),"*"in this.listeners&&this.invoke(this.listeners["*"],arguments)},c.prototype.invoke=function(a,b){for(var c=0,d=a.length;d>c;c++)a[c].apply(this,b)},b.Observable=c,b}),define("select2/results",["./utils"],function(a){function b(a,c,d){this.$element=a,this.data=d,b.__super__.constructor.call(this)}return a.Extend(b,a.Observable),b.prototype.render=function(){var a=$('<ul class="options" role="listbox"></ul>');return this.$results=a,a},b.prototype.clear=function(){this.$results.empty()},b.prototype.append=function(a){var b=[];a=this.sort(a);for(var c=0;c<a.length;c++){var d=a[c],e=this.option(d);b.push(e)}this.$results.append(b)},b.prototype.sort=function(a){return a},b.prototype.setClasses=function(){var a=this;this.data.current(function(b){var c=$.map(b,function(a){return a.id.toString()}),d=a.$results.find(".option[aria-selected]");d.each(function(){var a=$(this),b=a.data("data");null!=b.id&&c.indexOf(b.id.toString())>-1?a.attr("aria-selected","true"):a.attr("aria-selected","false")});var e=d.filter("[aria-selected=true]");e.length>0?e.first().trigger("mouseenter"):d.first().trigger("mouseenter")})},b.prototype.option=function(a){var b=$('<li class="option" role="option" aria-selected="false"></li>');if(a.children){b.addClass("group").removeAttr("aria-selected");var c=$('<strong class="group-label"></strong>');c.html(a.text);for(var d=[],e=0;e<a.children.length;e++){var f=a.children[e],g=this.option(f);d.push(g)}var h=$('<ul class="options nested-options"></ul>');h.append(d),b.append(c),b.append(h)}else b.html(a.text);return a.disabled&&b.removeAttr("aria-selected").attr("aria-disabled","true"),null==a.id&&b.removeClass("aria-selected"),b.data("data",a),b},b.prototype.bind=function(a){var b=this;a.on("results:all",function(a){b.clear(),b.append(a.data),b.setClasses()}),a.on("results:append",function(a){b.append(a.data),b.setClasses()}),a.on("select",function(){b.setClasses()}),a.on("unselect",function(){b.setClasses()}),a.on("open",function(){b.$results.attr("aria-expanded","true"),b.setClasses()}),a.on("close",function(){b.$results.attr("aria-expanded","false")}),a.on("results:select",function(){var a=b.$results.find(".highlighted"),c=a.data("data");"true"==a.attr("aria-selected")?b.trigger("unselected",{data:c}):b.trigger("selected",{data:c})}),this.$results.on("mouseup",".option[aria-selected]",function(a){var c=$(this),d=c.data("data");return"true"===c.attr("aria-selected")?void b.trigger("unselected",{originalEvent:a,data:d}):void b.trigger("selected",{originalEvent:a,data:d})}),this.$results.on("mouseenter",".option[aria-selected]",function(){b.$results.find(".option.highlighted").removeClass("highlighted"),$(this).addClass("highlighted")}),this.$results.on("mouseleave",".option",function(){$(this).removeClass("highlighted")})},b}),define("select2/selection/base",["../utils"],function(a){function b(a,c){this.$element=a,this.options=c,b.__super__.constructor.call(this)}return a.Extend(b,a.Observable),b.prototype.render=function(){throw new Error("The `render` method must be defined in child classes.")},b.prototype.bind=function(a){var b=this;a.on("selection:update",function(a){b.update(a.data)})},b.prototype.update=function(){throw new Error("The `update` method must be defined in child classes.")},b}),define("select2/keys",[],function(){var a={BACKSPACE:8,TAB:9,ENTER:13,SHIFT:16,CTRL:17,ALT:18,ESC:27,SPACE:32,PAGE_UP:33,PAGE_DOWN:34,END:35,HOME:36,LEFT:37,UP:38,RIGHT:39,DOWN:40,DELETE:46,isArrow:function(a){switch(a=a.which?a.which:a){case KEY.LEFT:case KEY.RIGHT:case KEY.UP:case KEY.DOWN:return!0}return!1}};return a}),define("select2/selection/single",["./base","../utils","../keys"],function(a,b,c){function d(){d.__super__.constructor.apply(this,arguments)}return b.Extend(d,a),d.prototype.render=function(){var a=$('<span class="single-select" tabindex="0"><span class="rendered-selection"></span></span>');return a.attr("title",this.$element.attr("title")),this.$selection=a,a},d.prototype.bind=function(a){var b=this;d.__super__.bind.apply(this,arguments),this.$selection.on("mousedown",function(a){1===a.which&&b.trigger("toggle",{originalEvent:a})}),this.$selection.on("focus",function(){}),this.$selection.on("blur",function(){}),this.$selection.on("keyup",function(d){var e=d.which;a.isOpen()?e==c.ENTER&&b.trigger("results:select"):(e==c.ENTER||e==c.SPACE)&&b.trigger("open")}),a.on("selection:update",function(a){b.update(a.data)})},d.prototype.clear=function(){this.$selection.find(".rendered-selection").empty()},d.prototype.display=function(a){return a.text},d.prototype.selectionContainer=function(){return $("<span></span>")},d.prototype.update=function(a){if(0===a.length)return void this.clear();var b=a[0],c=this.display(b);this.$selection.find(".rendered-selection").html(c)},d}),define("select2/selection/multiple",["./base","../utils"],function(a,b){function c(a,b){this.$element=a,this.options=b,c.__super__.constructor.call(this)}return b.Extend(c,a),c.prototype.render=function(){var a=$('<span class="multiple-select"><ul class="rendered-selection"></ul></span>');return this.$selection=a,a},c.prototype.bind=function(){var a=this;c.__super__.bind.apply(this,arguments),this.$selection.on("click",function(b){a.trigger("toggle",{originalEvent:b})}),this.$selection.on("click",".remove",function(b){var c=$(this),d=c.parent(),e=d.data("data");a.trigger("unselected",{originalEvent:b,data:e})})},c.prototype.clear=function(){this.$selection.find(".rendered-selection").empty()},c.prototype.display=function(a){return a.text},c.prototype.selectionContainer=function(){var a=$('<li class="choice"><span class="remove" role="presentation">&times;</span></li>');return a},c.prototype.update=function(a){if(this.clear(),0!==a.length){for(var b=[],c=0;c<a.length;c++){var d=a[c],e=this.display(d),f=this.selectionContainer();f.append(e),f.data("data",d),b.push(f)}this.$selection.find(".rendered-selection").append(b)}},c}),define("select2/selection/placeholder",["../utils"],function(){function a(a,b,c){this.placeholder=this.normalizePlaceholder(c.get("placeholder")),a.call(this,b,c)}return a.prototype.normalizePlaceholder=function(a,b){return"string"==typeof b&&(b={id:"",text:b}),b},a.prototype.update=function(a,b){var c=1==b.length&&b[0].id!=this.placeholder.id,d=b.length>1;if(d||c)return a.call(this,b);this.clear();var e=this.selectionContainer();e.html(this.display(this.placeholder)),e.addClass("placeholder").removeClass("choice"),this.$selection.find(".rendered-selection").append(e)},a}),define("select2/data/base",["../utils"],function(a){function b(){b.__super__.constructor.call(this)}return a.Extend(b,a.Observable),b.prototype.current=function(){throw new Error("The `current` method must be defined in child classes.")},b.prototype.query=function(){throw new Error("The `query` method must be defined in child classes.")},b.prototype.bind=function(){},b}),define("select2/data/select",["./base","../utils","jquery"],function(a,b,c){function d(a){this.$element=a,d.__super__.constructor.call(this)}return b.Extend(d,a),d.prototype.current=function(a){var b=[],d=this;this.$element.find(":selected").each(function(){var a=c(this),e=d.item(a);b.push(e)}),a(b)},d.prototype.select=function(a){var b=this;if(this.$element.prop("multiple"))this.current(function(c){var d=[];a=[a],a.push.apply(a,c);for(var e=0;e<a.length;e++)id=a[e].id,-1===d.indexOf(id)&&d.push(id);b.$element.val(d),b.$element.trigger("change")});else{var c=a.id;this.$element.val(c),this.$element.trigger("change")}},d.prototype.unselect=function(a){var b=this;this.$element.prop("multiple")&&this.current(function(c){for(var d=[],e=0;e<c.length;e++)id=c[e].id,id!==a.id&&-1===d.indexOf(id)&&d.push(id);b.$element.val(d),b.$element.trigger("change")})},d.prototype.bind=function(a){var b=this;a.on("select",function(a){b.select(a.data)}),a.on("unselect",function(a){b.unselect(a.data)})},d.prototype.query=function(a,b){var d=[],e=this,f=this.$element.children();f.each(function(){var b=c(this);if(b.is("option")||b.is("optgroup")){var f=e.item(b),g=e.matches(a,f);null!==g&&d.push(g)}}),b(d)},d.prototype.item=function(a){var b=a.data("data");if(null==b){if(a.is("option"))b={id:a.val(),text:a.html(),disabled:a.prop("disabled")};else if(a.is("optgroup")){b={text:a.attr("label"),children:[]};for(var d=a.children("option"),e=[],f=0;f<d.length;f++){var g=c(d[f]),h=this.item(g);e.push(h)}b.children=e}a.data("data",b)}return b},d.prototype.matches=function(a,b){var d=c.extend(!0,{},b);if(b.children){for(var e=b.children.length-1;e>=0;e--){var f=b.children[e],g=this.matches(a,f);null===g&&d.children.splice(e,1)}if(d.children.length>0)return d}return""===c.trim(a.term)?d:b.text.toUpperCase().indexOf(a.term.toUpperCase())>-1?d:null},d}),define("select2/data/array",["./select","../utils"],function(a,b){function c(a,b){this.data=b.options.data,c.__super__.constructor.call(this,a,b)}return b.Extend(c,a),c.prototype.select=function(a){var b=this;this.$element.find("option").each(function(){var c=$(this),d=b.item(c);d.id==a.id.toString()&&c.remove()});var d=this.option(a);this.$element.append(d),c.__super__.select.call(this,a)},c.prototype.option=function(a){var b=$("<option></option>");return b.text(a.text),b.val(a.id),b.data("data",a),b},c.prototype.query=function(a,b){var c=[],d=this;$.each(this.data,function(){var b=this;d.matches(a,b)&&c.push(b)}),b(c)},c}),define("select2/data/ajax",["./array","../utils","jquery"],function(a,b,c){function d(b,c){this.ajaxOptions=c.get("ajax"),this.processResults=this.ajaxOptions.processResults||function(a){return a},a.__super__.constructor.call(this,b,c)}return b.Extend(d,a),d.prototype.query=function(a,b){var d=this,e=c.extend({type:"GET"},this.ajaxOptions);"function"==typeof e.url&&(e.url=e.url(a)),"function"==typeof e.data&&(e.data=e.data(a));var f=c.ajax(e);f.success(function(a){var c=d.processResults(a);b(c)})},d}),define("select2/dropdown",["./utils"],function(a){function b(a){this.$element=a}return a.Extend(b,a.Observable),b.prototype.render=function(){var a=$('<span class="dropdown"><span class="results"></span></span>');return a},b.prototype.bind=function(){},b}),define("select2/dropdown/search",[],function(){function a(){}return a.prototype.render=function(a){var b=a.call(this),c=$('<span class="search"><input type="search" name="search" tabindex="-1" role="textbox" /></span>');return this.$searchContainer=c,this.$search=c.find("input"),b.prepend(c),b},a.prototype.bind=function(a,b,c){var d=this;a.call(this,b,c),this.$search.on("keyup",function(){b.trigger("query",{term:$(this).val()})}),b.on("open",function(){d.$search.attr("tabindex",0)}),b.on("close",function(){d.$search.attr("tabindex",-1)}),b.on("results:all",function(a){if(null==a.query.term||""===a.query.term){var b=d.showSearch(a);b?d.$searchContainer.show():d.$searchContainer.hide()}})},a.prototype.showSearch=function(){return!0},a}),define("select2/defaults",["./results","./selection/single","./selection/multiple","./selection/placeholder","./utils","./data/select","./data/array","./data/ajax","./dropdown","./dropdown/search"],function(a,b,c,d,e,f,g,h,i,j){function k(){this.reset()}k.prototype.apply=function(k){if(k=$.extend({},k,this.defaults),null==k.dataAdapter&&(k.dataAdapter=k.ajax?h:k.data?g:f),null==k.resultsAdapter&&(k.resultsAdapter=a),null==k.dropdownAdapter){var l=e.Decorate(i,j);k.dropdownAdapter=l}return null==k.selectionAdapter&&(k.selectionAdapter=k.multiple?c:b,null!=k.placeholder&&(k.selectionAdapter=e.Decorate(k.selectionAdapter,d))),k},k.prototype.reset=function(){this.defaults={}};var l=new k;return l}),define("select2/options",["./defaults"],function(a){function b(b){this.options=a.apply(b)}return b.prototype.fromElement=function(){return this},b.prototype.get=function(a){return this.options[a]},b.prototype.set=function(a,b){this.options[a]=b},b}),define("select2/core",["jquery","./options","./utils"],function(a,b,c){var d=function(a,c){this.$element=a,c=c||{},c.multiple=c.multiple||a.prop("multiple"),this.options=new b(c),d.__super__.constructor.call(this);var e=this.options.get("dataAdapter");this.data=new e(a,this.options);var f=this.render();this.$container=f,f.insertAfter(this.$element),f.width(a.outerWidth(!1));var g=this.options.get("selectionAdapter");this.selection=new g(a,this.options);var h=f.find(".selection"),i=this.selection.render();h.append(i);var j=this.options.get("dropdownAdapter");this.dropdown=new j(a,this.options);var k=f.find(".dropdown-wrapper"),l=this.dropdown.render();k.append(l);var m=this.options.get("resultsAdapter");this.results=new m(a,this.options,this.data);var n=l.find(".results"),o=this.results.render();n.append(o);var p=this;this.data.bind(this,f),this.selection.bind(this,f),this.dropdown.bind(this,f),this.results.bind(this,f),this.$element.on("change",function(){p.data.current(function(a){p.trigger("selection:update",{data:a})})}),this.selection.on("open",function(){p.trigger("open")}),this.selection.on("close",function(){p.trigger("close")}),this.selection.on("toggle",function(){p.toggleDropdown()}),this.selection.on("results:select",function(){p.trigger("results:select")}),this.selection.on("unselected",function(a){p.trigger("unselect",a),p.trigger("close")}),this.results.on("selected",function(a){p.trigger("select",a),p.trigger("close")}),this.results.on("unselected",function(a){p.trigger("unselect",a),p.trigger("close")}),this.on("open",function(){f.addClass("open")}),this.on("close",function(){f.removeClass("open")}),this.data.current(function(a){p.trigger("selection:update",{data:a})}),this.on("query",function(a){this.data.query(a,function(b){p.trigger("results:all",{data:b,query:a})})}),this.trigger("query",{}),a.hide(),a.attr("tabindex","-1")};return c.Extend(d,c.Observable),d.prototype.toggleDropdown=function(){this.trigger(this.isOpen()?"close":"open")},d.prototype.isOpen=function(){return this.$container.hasClass("open")},d.prototype.render=function(){var b=a('<span class="select2 select2-container select2-theme-default"><span class="selection"></span><span class="dropdown-wrapper"></span></span>');return b},d}),define("jquery.select2",["jquery","select2/core"],function(a,b){return null==a.fn.select2&&(a.fn.select2=function(c){if(c=c||{},"object"==typeof c)this.each(function(){new b(a(this),c)});else{if("string"!=typeof c)throw new Error("Invalid arguments for Select2: "+c);var d=this.data("select2");d[c](arguments.slice(1))}}),b}),require("jquery.select2");
\ No newline at end of file
diff --git a/docs/examples.html b/docs/examples.html
index 875c49e2..c3eb329e 100644
--- a/docs/examples.html
+++ b/docs/examples.html
@@ -48,6 +48,10 @@ $(document).ready(function() {
     <div class="col-md-4">
       <h1>Multiple select boxes</h1>
 
+      <p>
+        <select class="js-states" multiple="multiple"></select>
+      </p>
+
       <p>
         Select2 also supports multi-value select boxes. The select below is declared with the <code>multiple</code> attribute.
       </p>
diff --git a/src/js/select2/core.js b/src/js/select2/core.js
index 498fda3e..dcf88af6 100644
--- a/src/js/select2/core.js
+++ b/src/js/select2/core.js
@@ -68,10 +68,20 @@ define([
       });
     });
 
+    this.selection.on('open', function () {
+      self.trigger('open');
+    });
+    this.selection.on('close', function () {
+      self.trigger('close');
+    });
     this.selection.on('toggle', function () {
       self.toggleDropdown();
     });
 
+    this.selection.on('results:select', function () {
+      self.trigger('results:select');
+    });
+
     this.selection.on('unselected', function (params) {
       self.trigger('unselect', params);
 
@@ -120,18 +130,23 @@ define([
     // Hide the original select
 
     $element.hide();
+    $element.attr('tabindex', '-1');
   };
 
   Utils.Extend(Select2, Utils.Observable);
 
   Select2.prototype.toggleDropdown = function () {
-    if (this.$container.hasClass('open')) {
+    if (this.isOpen()) {
       this.trigger('close');
     } else {
       this.trigger('open');
     }
   };
 
+  Select2.prototype.isOpen = function () {
+    return this.$container.hasClass('open');
+  };
+
   Select2.prototype.render = function () {
     var $container = $(
       '<span class="select2 select2-container select2-theme-default">' +
diff --git a/src/js/select2/dropdown/search.js b/src/js/select2/dropdown/search.js
index 14bbd043..a5c11d3c 100644
--- a/src/js/select2/dropdown/search.js
+++ b/src/js/select2/dropdown/search.js
@@ -8,7 +8,7 @@ define([
 
     var $search = $(
       '<span class="search">' +
-        '<input type="search" name="search" />' +
+        '<input type="search" name="search" tabindex="-1" role="textbox" />' +
       '</span>'
     );
 
@@ -31,6 +31,14 @@ define([
       });
     });
 
+    container.on('open', function () {
+      self.$search.attr('tabindex', 0);
+    });
+
+    container.on('close', function () {
+      self.$search.attr('tabindex', -1);
+    });
+
     container.on('results:all', function (params) {
       if (params.query.term == null || params.query.term === '') {
         var showSearch = self.showSearch(params);
diff --git a/src/js/select2/keys.js b/src/js/select2/keys.js
new file mode 100644
index 00000000..9a57d391
--- /dev/null
+++ b/src/js/select2/keys.js
@@ -0,0 +1,39 @@
+define([
+
+], function () {
+  var KEYS = {
+    BACKSPACE: 8,
+    TAB: 9,
+    ENTER: 13,
+    SHIFT: 16,
+    CTRL: 17,
+    ALT: 18,
+    ESC: 27,
+    SPACE: 32,
+    PAGE_UP: 33,
+    PAGE_DOWN: 34,
+    END: 35,
+    HOME: 36,
+    LEFT: 37,
+    UP: 38,
+    RIGHT: 39,
+    DOWN: 40,
+    DELETE: 46,
+
+    isArrow: function (k) {
+        k = k.which ? k.which : k;
+
+        switch (k) {
+        case KEY.LEFT:
+        case KEY.RIGHT:
+        case KEY.UP:
+        case KEY.DOWN:
+            return true;
+        }
+
+        return false;
+    }
+  };
+
+  return KEYS;
+});
diff --git a/src/js/select2/results.js b/src/js/select2/results.js
index bcc58b78..524d4284 100644
--- a/src/js/select2/results.js
+++ b/src/js/select2/results.js
@@ -12,7 +12,7 @@ define([
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="options"></ul>'
+      '<ul class="options" role="listbox"></ul>'
     );
 
     this.$results = $results;
@@ -52,28 +52,42 @@ define([
         return s.id.toString();
       });
 
-      self.$results.find('.option.selected').removeClass('selected');
-
-      var $options = self.$results.find('.option');
+      var $options = self.$results.find('.option[aria-selected]');
 
       $options.each(function () {
         var $option = $(this);
         var item = $option.data('data');
 
         if (item.id != null && selectedIds.indexOf(item.id.toString()) > -1) {
-          $option.addClass('selected');
+          $option.attr('aria-selected', 'true');
+        } else {
+          $option.attr('aria-selected', 'false');
         }
       });
+
+      var $selected = $options.filter('[aria-selected=true]');
+
+      // Check if there are any selected options
+      if ($selected.length > 0) {
+        // If there are selected options, highlight the first
+        $selected.first().trigger('mouseenter');
+      } else {
+        // If there are no selected options, highlight the first option
+        // in the dropdown
+        $options.first().trigger('mouseenter');
+      }
     });
   };
 
   Results.prototype.option = function (data) {
     var $option = $(
-      '<li class="option highlightable selectable"></li>'
+      '<li class="option" role="option" aria-selected="false"></li>'
     );
 
     if (data.children) {
-      $option.addClass('group').removeClass('highlightable selectable');
+      $option
+        .addClass('group')
+        .removeAttr('aria-selected');
 
       var $label = $('<strong class="group-label"></strong>');
       $label.html(data.text);
@@ -99,11 +113,13 @@ define([
     }
 
     if (data.disabled) {
-      $option.removeClass('selectable highlightable').addClass('disabled');
+      $option
+        .removeAttr('aria-selected')
+        .attr('aria-disabled', 'true');
     }
 
     if (data.id == null) {
-      $option.removeClass('selectable highlightable');
+      $option.removeClass('aria-selected');
     }
 
     $option.data('data', data);
@@ -135,11 +151,40 @@ define([
       self.setClasses();
     });
 
-    this.$results.on('mouseup', '.option.selectable', function (evt) {
+    container.on('open', function () {
+      // When the dropdown is open, aria-expended="true"
+      self.$results.attr('aria-expanded', 'true');
+
+      self.setClasses();
+    });
+
+    container.on('close', function () {
+      // When the dropdown is closed, aria-expended="false"
+      self.$results.attr('aria-expanded', 'false');
+    });
+
+    container.on('results:select', function () {
+      var $highlighted = self.$results.find('.highlighted');
+
+      var data = $highlighted.data('data');
+
+      if ($highlighted.attr('aria-selected') == 'true') {
+        self.trigger('unselected', {
+          data: data
+        });
+      } else {
+        self.trigger('selected', {
+          data: data
+        });
+      }
+    });
+
+    this.$results.on('mouseup', '.option[aria-selected]', function (evt) {
       var $this = $(this);
 
       var data = $this.data('data');
-      if ($this.hasClass('selected')) {
+
+      if ($this.attr('aria-selected') === 'true') {
         self.trigger('unselected', {
           originalEvent: evt,
           data: data
@@ -154,7 +199,7 @@ define([
       });
     });
 
-    this.$results.on('mouseenter', '.option.highlightable', function (evt) {
+    this.$results.on('mouseenter', '.option[aria-selected]', function (evt) {
       self.$results.find('.option.highlighted').removeClass('highlighted');
       $(this).addClass('highlighted');
     });
diff --git a/src/js/select2/selection/multiple.js b/src/js/select2/selection/multiple.js
index 3df60a7f..008e4720 100644
--- a/src/js/select2/selection/multiple.js
+++ b/src/js/select2/selection/multiple.js
@@ -58,7 +58,7 @@ define([
   MultipleSelection.prototype.selectionContainer = function () {
     var $container = $(
       '<li class="choice">' +
-        '<span class="remove">&times;</span>' +
+        '<span class="remove" role="presentation">&times;</span>' +
       '</li>'
     );
 
diff --git a/src/js/select2/selection/single.js b/src/js/select2/selection/single.js
index 31a14681..f72ddfac 100644
--- a/src/js/select2/selection/single.js
+++ b/src/js/select2/selection/single.js
@@ -1,7 +1,8 @@
 define([
   './base',
-  '../utils'
-], function (BaseSelection, Utils) {
+  '../utils',
+  '../keys'
+], function (BaseSelection, Utils, KEYS) {
   function SingleSelection () {
     SingleSelection.__super__.constructor.apply(this, arguments);
   }
@@ -10,11 +11,13 @@ define([
 
   SingleSelection.prototype.render = function () {
     var $selection = $(
-      '<span class="single-select">' +
+      '<span class="single-select" tabindex="0">' +
         '<span class="rendered-selection"></span>' +
       '</span>'
     );
 
+    $selection.attr('title', this.$element.attr('title'));
+
     this.$selection = $selection;
 
     return $selection;
@@ -36,6 +39,28 @@ define([
       });
     });
 
+    this.$selection.on('focus', function (evt) {
+      // User focuses on the container
+    });
+
+    this.$selection.on('blur', function (evt) {
+      // User exits the container
+    });
+
+    this.$selection.on('keyup', function (evt) {
+      var key = evt.which;
+
+      if (container.isOpen()) {
+        if (key == KEYS.ENTER) {
+          self.trigger('results:select');
+        }
+      } else {
+        if (key == KEYS.ENTER || key == KEYS.SPACE) {
+          self.trigger('open');
+        }
+      }
+    });
+
     container.on('selection:update', function (params) {
       self.update(params.data);
     });
diff --git a/src/scss/_dropdown.scss b/src/scss/_dropdown.scss
index 54d7fb1d..fffa8f8c 100644
--- a/src/scss/_dropdown.scss
+++ b/src/scss/_dropdown.scss
@@ -36,11 +36,14 @@
         padding: 0;
 
         .option {
-          cursor: pointer;
           padding: 6px;
 
           user-select: none;
           -webkit-user-select: none;
+
+          &[aria-selected] {
+              cursor: pointer;
+          }
         }
       }
     }
diff --git a/src/scss/theme/default/layout.scss b/src/scss/theme/default/layout.scss
index 971889e5..56e21a52 100644
--- a/src/scss/theme/default/layout.scss
+++ b/src/scss/theme/default/layout.scss
@@ -93,15 +93,15 @@
             }
           }
 
-          &.disabled {
+          &[aria-disabled=true] {
             color: #666;
           }
 
-          &.selected {
+          &[aria-selected=true] {
             background-color: #ddd;
           }
 
-          &.highlightable.highlighted {
+          &[aria-selected].highlighted {
             background-color: #5897fb;
             color: white;
           }