From cdfa0499f40b5ea3754f5bbcce6c81ee92b8a572 Mon Sep 17 00:00:00 2001
From: Kevin Brown <kevin@kevinbrown.in>
Date: Sun, 19 Oct 2014 20:40:45 -0400
Subject: [PATCH] Accessibility matches better

Now the accessibility for the single select box better matches what
is picked up for a native select.

This fixes an issue with us always setting `aria-activedescendant`,
which caused Orca to always say the full path to the selected
result, instead of saying that the box was a combobox with a
selection. This means that the `aria-activedescendant` attribute
will now only be set when the dropdown is open.

This also switches the results list from a listbox to a tree, which
is what Firefox tells screen readers that a standard select is.
Combined with a change to use `role=group` and `aria-label` for
option group labels, screen readers will now announce the group
that they are in as well.
---
 dist/css/select2.css               |  4 ++--
 dist/css/select2.min.css           |  2 +-
 dist/js/select2.amd.full.js        | 32 ++++++++++++++++++++----------
 dist/js/select2.amd.js             | 32 ++++++++++++++++++++----------
 dist/js/select2.full.js            | 32 ++++++++++++++++++++----------
 dist/js/select2.full.min.js        |  4 ++--
 dist/js/select2.js                 | 32 ++++++++++++++++++++----------
 dist/js/select2.min.js             |  2 +-
 src/js/select2/results.js          | 23 ++++++++++++++++-----
 src/js/select2/selection/single.js |  9 +++------
 src/scss/theme/default/layout.scss |  2 +-
 11 files changed, 112 insertions(+), 62 deletions(-)

diff --git a/dist/css/select2.css b/dist/css/select2.css
index aa386515..cfc4bbea 100644
--- a/dist/css/select2.css
+++ b/dist/css/select2.css
@@ -110,9 +110,9 @@
 .select2-container.select2-theme-default .dropdown .results > .options {
   max-height: 200px;
   overflow-y: auto; }
-.select2-container.select2-theme-default .dropdown .results .options .option.group {
+.select2-container.select2-theme-default .dropdown .results .options .option[role=group] {
   padding: 0; }
-  .select2-container.select2-theme-default .dropdown .results .options .option.group .group-label {
+  .select2-container.select2-theme-default .dropdown .results .options .option[role=group] .group-label {
     cursor: default;
     display: block;
     padding: 6px; }
diff --git a/dist/css/select2.min.css b/dist/css/select2.min.css
index 97e1f15a..b2f0fe62 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{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>.options{max-height:200px;overflow-y:auto;}.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:#999;}.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
+.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>.options{max-height:200px;overflow-y:auto;}.select2-container.select2-theme-default .dropdown .results .options .option[role=group]{padding:0;}.select2-container.select2-theme-default .dropdown .results .options .option[role=group] .group-label{cursor:default;display:block;padding:6px;}.select2-container.select2-theme-default .dropdown .results .options .option[aria-disabled=true]{color:#999;}.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 6fd7f37f..6bfcb621 100644
--- a/dist/js/select2.amd.full.js
+++ b/dist/js/select2.amd.full.js
@@ -163,7 +163,7 @@ define('select2/results',[
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="options" role="listbox"></ul>'
+      '<ul class="options" role="tree"></ul>'
     );
 
     if (this.options.get('multiple')) {
@@ -236,12 +236,13 @@ define('select2/results',[
 
   Results.prototype.option = function (data) {
     var $option = $(
-      '<li class="option" role="option" aria-selected="false"></li>'
+      '<li class="option" role="treeitem" aria-selected="false"></li>'
     );
 
     if (data.children) {
       $option
-        .addClass('group')
+        .attr('role', 'group')
+        .attr('aria-label', data.text)
         .removeAttr('aria-selected');
 
       var $label = $('<strong class="group-label"></strong>');
@@ -297,20 +298,32 @@ define('select2/results',[
       self.clear();
       self.append(params.data);
 
-      self.setClasses();
+      if (container.isOpen()) {
+        self.setClasses();
+      }
     });
 
     container.on('results:append', function (params) {
       self.append(params.data);
 
-      self.setClasses();
+      if (container.isOpen()) {
+        self.setClasses();
+      }
     });
 
     container.on('select', function () {
+      if (!container.isOpen()) {
+        return;
+      }
+
       self.setClasses();
     });
 
     container.on('unselect', function () {
+      if (!container.isOpen()) {
+        return;
+      }
+
       self.setClasses();
     });
 
@@ -580,13 +593,14 @@ define('select2/selection/single',[
     });
 
     container.on('open', function () {
-      // When the dropdown is open, aria-expended="true"
+      // When the dropdown is open, aria-expanded="true"
       self.$selection.attr('aria-expanded', 'true');
     });
 
     container.on('close', function () {
-      // When the dropdown is closed, aria-expended="false"
+      // When the dropdown is closed, aria-expanded="false"
       self.$selection.attr('aria-expanded', 'false');
+      self.$selection.removeAttr('aria-activedescendant');
     });
 
     this.$selection.on('focus', function (evt) {
@@ -655,10 +669,6 @@ define('select2/selection/single',[
     var formatted = this.display(selection);
 
     this.$selection.find('.rendered-selection').html(formatted);
-
-    if (data[0]._resultId != null) {
-      this.$selection.attr('aria-activedescendant', data[0]._resultId);
-    }
   };
 
   return SingleSelection;
diff --git a/dist/js/select2.amd.js b/dist/js/select2.amd.js
index 6fd7f37f..6bfcb621 100644
--- a/dist/js/select2.amd.js
+++ b/dist/js/select2.amd.js
@@ -163,7 +163,7 @@ define('select2/results',[
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="options" role="listbox"></ul>'
+      '<ul class="options" role="tree"></ul>'
     );
 
     if (this.options.get('multiple')) {
@@ -236,12 +236,13 @@ define('select2/results',[
 
   Results.prototype.option = function (data) {
     var $option = $(
-      '<li class="option" role="option" aria-selected="false"></li>'
+      '<li class="option" role="treeitem" aria-selected="false"></li>'
     );
 
     if (data.children) {
       $option
-        .addClass('group')
+        .attr('role', 'group')
+        .attr('aria-label', data.text)
         .removeAttr('aria-selected');
 
       var $label = $('<strong class="group-label"></strong>');
@@ -297,20 +298,32 @@ define('select2/results',[
       self.clear();
       self.append(params.data);
 
-      self.setClasses();
+      if (container.isOpen()) {
+        self.setClasses();
+      }
     });
 
     container.on('results:append', function (params) {
       self.append(params.data);
 
-      self.setClasses();
+      if (container.isOpen()) {
+        self.setClasses();
+      }
     });
 
     container.on('select', function () {
+      if (!container.isOpen()) {
+        return;
+      }
+
       self.setClasses();
     });
 
     container.on('unselect', function () {
+      if (!container.isOpen()) {
+        return;
+      }
+
       self.setClasses();
     });
 
@@ -580,13 +593,14 @@ define('select2/selection/single',[
     });
 
     container.on('open', function () {
-      // When the dropdown is open, aria-expended="true"
+      // When the dropdown is open, aria-expanded="true"
       self.$selection.attr('aria-expanded', 'true');
     });
 
     container.on('close', function () {
-      // When the dropdown is closed, aria-expended="false"
+      // When the dropdown is closed, aria-expanded="false"
       self.$selection.attr('aria-expanded', 'false');
+      self.$selection.removeAttr('aria-activedescendant');
     });
 
     this.$selection.on('focus', function (evt) {
@@ -655,10 +669,6 @@ define('select2/selection/single',[
     var formatted = this.display(selection);
 
     this.$selection.find('.rendered-selection').html(formatted);
-
-    if (data[0]._resultId != null) {
-      this.$selection.attr('aria-activedescendant', data[0]._resultId);
-    }
   };
 
   return SingleSelection;
diff --git a/dist/js/select2.full.js b/dist/js/select2.full.js
index b3b19962..94e6968b 100644
--- a/dist/js/select2.full.js
+++ b/dist/js/select2.full.js
@@ -9701,7 +9701,7 @@ define('select2/results',[
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="options" role="listbox"></ul>'
+      '<ul class="options" role="tree"></ul>'
     );
 
     if (this.options.get('multiple')) {
@@ -9774,12 +9774,13 @@ define('select2/results',[
 
   Results.prototype.option = function (data) {
     var $option = $(
-      '<li class="option" role="option" aria-selected="false"></li>'
+      '<li class="option" role="treeitem" aria-selected="false"></li>'
     );
 
     if (data.children) {
       $option
-        .addClass('group')
+        .attr('role', 'group')
+        .attr('aria-label', data.text)
         .removeAttr('aria-selected');
 
       var $label = $('<strong class="group-label"></strong>');
@@ -9835,20 +9836,32 @@ define('select2/results',[
       self.clear();
       self.append(params.data);
 
-      self.setClasses();
+      if (container.isOpen()) {
+        self.setClasses();
+      }
     });
 
     container.on('results:append', function (params) {
       self.append(params.data);
 
-      self.setClasses();
+      if (container.isOpen()) {
+        self.setClasses();
+      }
     });
 
     container.on('select', function () {
+      if (!container.isOpen()) {
+        return;
+      }
+
       self.setClasses();
     });
 
     container.on('unselect', function () {
+      if (!container.isOpen()) {
+        return;
+      }
+
       self.setClasses();
     });
 
@@ -10118,13 +10131,14 @@ define('select2/selection/single',[
     });
 
     container.on('open', function () {
-      // When the dropdown is open, aria-expended="true"
+      // When the dropdown is open, aria-expanded="true"
       self.$selection.attr('aria-expanded', 'true');
     });
 
     container.on('close', function () {
-      // When the dropdown is closed, aria-expended="false"
+      // When the dropdown is closed, aria-expanded="false"
       self.$selection.attr('aria-expanded', 'false');
+      self.$selection.removeAttr('aria-activedescendant');
     });
 
     this.$selection.on('focus', function (evt) {
@@ -10193,10 +10207,6 @@ define('select2/selection/single',[
     var formatted = this.display(selection);
 
     this.$selection.find('.rendered-selection').html(formatted);
-
-    if (data[0]._resultId != null) {
-      this.$selection.attr('aria-activedescendant', data[0]._resultId);
-    }
   };
 
   return SingleSelection;
diff --git a/dist/js/select2.full.min.js b/dist/js/select2.full.min.js
index ec5daf92..5d279366 100644
--- a/dist/js/select2.full.min.js
+++ b/dist/js/select2.full.min.js
@@ -1,4 +1,4 @@
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b.html(a.text);return a.disabled&&b.removeAttr("aria-selected").attr("aria-disabled","true"),null==a.id&&b.removeAttr("aria-selected"),null!=a._resultId&&b.attr("id",a._resultId),b.data("data",a),b},b.prototype.bind=function(a){var b=this,c=a.id+"-results";this.$results.attr("id",c),a.on("results:all",function(a){b.clear(),b.append(a.data),b.setClasses()}),a.on("results:append",function(a){b.append(a.data),b.setClasses()}),a.on("select",function(){b.setClasses()}),a.on("unselect",function(){b.setClasses()}),a.on("open",function(){b.$results.attr("aria-expanded","true"),b.$results.attr("aria-hidden","false"),b.setClasses()}),a.on("close",function(){b.$results.attr("aria-expanded","false"),b.$results.attr("aria-hidden","true"),b.$results.removeAttr("aria-activedescendant")}),a.on("results:select",function(){var a=b.$results.find(".highlighted");if(0!==a.length){var c=a.data("data");"true"==a.attr("aria-selected")?b.trigger("unselected",{data:c}):b.trigger("selected",{data:c})}}),a.on("results:previous",function(){var a=b.$results.find(".highlighted"),c=b.$results.find("[aria-selected]"),d=c.index(a);if(0!==d){var e=d-1;0===a.length&&(e=0);var f=c.eq(e);f.trigger("mouseenter");var g=b.$results.offset().top,h=f.offset().top,i=b.$results.scrollTop()+(h-g);0===e?b.$results.scrollTop(0):0>h-g&&b.$results.scrollTop(i)}}),a.on("results:next",function(){var a=b.$results.find(".highlighted"),c=b.$results.find("[aria-selected]"),d=c.index(a),e=d+1;if(!(e>=c.length)){var f=c.eq(e);f.trigger("mouseenter");var g=b.$results.offset().top+b.$results.outerHeight(!1),h=f.offset().top+f.outerHeight(!1),i=b.$results.scrollTop()+h-g;0===e?b.$results.scrollTop(0):h>g&&b.$results.scrollTop(i)}}),a.on("results:focus",function(a){a.element.addClass("highlighted")}),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.$results.on("mouseenter",".option[aria-selected]",function(){var a=$(this).data("data");b.$results.find(".option.highlighted").removeClass("highlighted"),b.trigger("results:focus",{data:a,element:$(this)})}),this.$results.on("mouseleave",".option",function(){$(this).hasClass("highlighted")&&($(this).removeClass("highlighted"),b.$results.removeAttr("aria-activedescendant"))})},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" role="combobox" aria-autocomplete="list" aria-haspopup="true" aria-expanded="false"><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);var e=a.id+"-container",f=a.id+"-results";this.$selection.find(".rendered-selection").attr("id",e),this.$selection.attr("aria-labelledby",e),this.$selection.attr("aria-owns",f),this.$selection.on("mousedown",function(a){1===a.which&&b.trigger("toggle",{originalEvent:a})}),a.on("open",function(){b.$selection.attr("aria-expanded","true")}),a.on("close",function(){b.$selection.attr("aria-expanded","false")}),this.$selection.on("focus",function(){}),this.$selection.on("blur",function(){}),this.$selection.on("keydown",function(d){var e=d.which;a.isOpen()?e==c.ENTER?(b.trigger("results:select"),d.preventDefault()):e==c.UP?(b.trigger("results:previous"),d.preventDefault()):e==c.DOWN&&(b.trigger("results:next"),d.preventDefault()):(e==c.ENTER||e==c.SPACE)&&(b.trigger("open"),d.preventDefault())}),a.on("results:focus",function(a){b.$selection.attr("aria-activedescendant",a.data._resultId)}),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),null!=a[0]._resultId&&this.$selection.attr("aria-activedescendant",a[0]._resultId)},d}),define("select2/selection/multiple",["./base","../utils"],function(a,b){function c(a,b){this.$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.$selection.find(".rendered-selection").append(e)},a}),define("select2/data/base",["../utils"],function(a){function b(){b.__super__.constructor.call(this)}return a.Extend(b,a.Observable),b.prototype.current=function(){throw new Error("The `current` method must be defined in child classes.")},b.prototype.query=function(){throw new Error("The `query` method must be defined in child classes.")},b.prototype.bind=function(){},b.prototype.generateResultId=function(b,c){var d=b.id+"-result-";return d+=a.generateChars(4),d+=null!=c.id?"-"+c.id.toString():"-"+a.generateChars(4)},b}),define("select2/data/select",["./base","../utils","jquery"],function(a,b,c){function d(a){this.$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.$element.trigger("change")})},d.prototype.bind=function(a){var b=this;this.container=a,a.on("select",function(a){b.select(a.data)}),a.on("unselect",function(a){b.unselect(a.data)})},d.prototype.query=function(a,b){var d=[],e=this,f=this.$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}b.id&&(b._resultId=this.generateResultId(this.container,b)),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=$.extend({},k,this.defaults),null==k.dataAdapter&&(k.dataAdapter=k.ajax?h:k.data?g:f),null==k.resultsAdapter&&(k.resultsAdapter=a),null==k.dropdownAdapter){var l=e.Decorate(i,j);k.dropdownAdapter=l}return null==k.selectionAdapter&&(k.selectionAdapter=k.multiple?c:b,null!=k.placeholder&&(k.selectionAdapter=e.Decorate(k.selectionAdapter,d))),k},k.prototype.reset=function(){this.defaults={}};var l=new k;return l}),define("select2/options",["./defaults"],function(a){function b(b){this.options=a.apply(b)}return b.prototype.fromElement=function(){return this},b.prototype.get=function(a){return this.options[a]},b.prototype.set=function(a,b){this.options[a]=b},b}),define("select2/core",["jquery","./options","./utils"],function(a,b,c){var d=function(a,e){this.$element=a,this.id=null!=a.attr("id")?a.attr("id"):null!=a.attr("name")?a.attr("name")+"-"+c.generateChars(2):c.generateChars(4),this.id="select2-"+this.id,e=e||{},e.multiple=e.multiple||a.prop("multiple"),this.options=new b(e),d.__super__.constructor.call(this);var f=this.options.get("dataAdapter");this.data=new f(a,this.options);var g=this.render();this.$container=g,g.insertAfter(this.$element),g.width(a.outerWidth(!1));var h=this.options.get("selectionAdapter");this.selection=new h(a,this.options);var i=g.find(".selection"),j=this.selection.render();i.append(j);var k=this.options.get("dropdownAdapter");this.dropdown=new k(a,this.options);var l=g.find(".dropdown-wrapper"),m=this.dropdown.render();l.append(m);var n=this.options.get("resultsAdapter");this.results=new n(a,this.options,this.data);var o=m.find(".results"),p=this.results.render();o.append(p);var q=this;this.data.bind(this,g),this.selection.bind(this,g),this.dropdown.bind(this,g),this.results.bind(this,g),this.$element.on("change",function(){q.data.current(function(a){q.trigger("selection:update",{data:a})})}),this.selection.on("open",function(){q.trigger("open")}),this.selection.on("close",function(){q.trigger("close")}),this.selection.on("toggle",function(){q.toggleDropdown()}),this.selection.on("results:select",function(){q.trigger("results:select")}),this.selection.on("results:previous",function(){q.trigger("results:previous")}),this.selection.on("results:next",function(){q.trigger("results:next")}),this.selection.on("unselected",function(a){q.trigger("unselect",a),q.trigger("close")}),this.results.on("selected",function(a){q.trigger("select",a),q.trigger("close")}),this.results.on("unselected",function(a){q.trigger("unselect",a),q.trigger("close")}),this.results.on("results:focus",function(a){q.trigger("results:focus",a)}),this.on("open",function(){g.addClass("open")}),this.on("close",function(){g.removeClass("open")}),this.data.current(function(a){q.trigger("selection:update",{data:a})}),this.on("query",function(a){this.data.query(a,function(b){q.trigger("results:all",{data:b,query:a})})}),this.trigger("query",{}),a.hide(),a.attr("tabindex","-1")};return c.Extend(d,c.Observable),d.prototype.toggleDropdown=function(){this.trigger(this.isOpen()?"close":"open")},d.prototype.isOpen=function(){return this.$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" aria-hidden="true"></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 03fdd850..b9d8feb8 100644
--- a/dist/js/select2.js
+++ b/dist/js/select2.js
@@ -592,7 +592,7 @@ define('select2/results',[
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="options" role="listbox"></ul>'
+      '<ul class="options" role="tree"></ul>'
     );
 
     if (this.options.get('multiple')) {
@@ -665,12 +665,13 @@ define('select2/results',[
 
   Results.prototype.option = function (data) {
     var $option = $(
-      '<li class="option" role="option" aria-selected="false"></li>'
+      '<li class="option" role="treeitem" aria-selected="false"></li>'
     );
 
     if (data.children) {
       $option
-        .addClass('group')
+        .attr('role', 'group')
+        .attr('aria-label', data.text)
         .removeAttr('aria-selected');
 
       var $label = $('<strong class="group-label"></strong>');
@@ -726,20 +727,32 @@ define('select2/results',[
       self.clear();
       self.append(params.data);
 
-      self.setClasses();
+      if (container.isOpen()) {
+        self.setClasses();
+      }
     });
 
     container.on('results:append', function (params) {
       self.append(params.data);
 
-      self.setClasses();
+      if (container.isOpen()) {
+        self.setClasses();
+      }
     });
 
     container.on('select', function () {
+      if (!container.isOpen()) {
+        return;
+      }
+
       self.setClasses();
     });
 
     container.on('unselect', function () {
+      if (!container.isOpen()) {
+        return;
+      }
+
       self.setClasses();
     });
 
@@ -1009,13 +1022,14 @@ define('select2/selection/single',[
     });
 
     container.on('open', function () {
-      // When the dropdown is open, aria-expended="true"
+      // When the dropdown is open, aria-expanded="true"
       self.$selection.attr('aria-expanded', 'true');
     });
 
     container.on('close', function () {
-      // When the dropdown is closed, aria-expended="false"
+      // When the dropdown is closed, aria-expanded="false"
       self.$selection.attr('aria-expanded', 'false');
+      self.$selection.removeAttr('aria-activedescendant');
     });
 
     this.$selection.on('focus', function (evt) {
@@ -1084,10 +1098,6 @@ define('select2/selection/single',[
     var formatted = this.display(selection);
 
     this.$selection.find('.rendered-selection').html(formatted);
-
-    if (data[0]._resultId != null) {
-      this.$selection.attr('aria-activedescendant', data[0]._resultId);
-    }
   };
 
   return SingleSelection;
diff --git a/dist/js/select2.min.js b/dist/js/select2.min.js
index f52df5a7..279cef23 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},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,e){this.$element=a,this.id=null!=a.attr("id")?a.attr("id"):null!=a.attr("name")?a.attr("name")+"-"+c.generateChars(2):c.generateChars(4),this.id="select2-"+this.id,e=e||{},e.multiple=e.multiple||a.prop("multiple"),this.options=new b(e),d.__super__.constructor.call(this);var f=this.options.get("dataAdapter");this.data=new f(a,this.options);var g=this.render();this.$container=g,g.insertAfter(this.$element),g.width(a.outerWidth(!1));var h=this.options.get("selectionAdapter");this.selection=new h(a,this.options);var i=g.find(".selection"),j=this.selection.render();i.append(j);var k=this.options.get("dropdownAdapter");this.dropdown=new k(a,this.options);var l=g.find(".dropdown-wrapper"),m=this.dropdown.render();l.append(m);var n=this.options.get("resultsAdapter");this.results=new n(a,this.options,this.data);var o=m.find(".results"),p=this.results.render();o.append(p);var q=this;this.data.bind(this,g),this.selection.bind(this,g),this.dropdown.bind(this,g),this.results.bind(this,g),this.$element.on("change",function(){q.data.current(function(a){q.trigger("selection:update",{data:a})})}),this.selection.on("open",function(){q.trigger("open")}),this.selection.on("close",function(){q.trigger("close")}),this.selection.on("toggle",function(){q.toggleDropdown()}),this.selection.on("results:select",function(){q.trigger("results:select")}),this.selection.on("results:previous",function(){q.trigger("results:previous")}),this.selection.on("results:next",function(){q.trigger("results:next")}),this.selection.on("unselected",function(a){q.trigger("unselect",a),q.trigger("close")}),this.results.on("selected",function(a){q.trigger("select",a),q.trigger("close")}),this.results.on("unselected",function(a){q.trigger("unselect",a),q.trigger("close")}),this.on("open",function(){g.addClass("open")}),this.on("close",function(){g.removeClass("open")}),this.data.current(function(a){q.trigger("selection:update",{data:a})}),this.on("query",function(a){this.data.query(a,function(b){q.trigger("results:all",{data:b,query:a})})}),this.trigger("query",{}),a.hide(),a.attr("tabindex","-1")};return 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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,e){this.$element=a,this.id=null!=a.attr("id")?a.attr("id"):null!=a.attr("name")?a.attr("name")+"-"+c.generateChars(2):c.generateChars(4),this.id="select2-"+this.id,e=e||{},e.multiple=e.multiple||a.prop("multiple"),this.options=new b(e),d.__super__.constructor.call(this);var f=this.options.get("dataAdapter");this.data=new f(a,this.options);var g=this.render();this.$container=g,g.insertAfter(this.$element),g.width(a.outerWidth(!1));var h=this.options.get("selectionAdapter");this.selection=new h(a,this.options);var i=g.find(".selection"),j=this.selection.render();i.append(j);var k=this.options.get("dropdownAdapter");this.dropdown=new k(a,this.options);var l=g.find(".dropdown-wrapper"),m=this.dropdown.render();l.append(m);var n=this.options.get("resultsAdapter");this.results=new n(a,this.options,this.data);var o=m.find(".results"),p=this.results.render();o.append(p);var q=this;this.data.bind(this,g),this.selection.bind(this,g),this.dropdown.bind(this,g),this.results.bind(this,g),this.$element.on("change",function(){q.data.current(function(a){q.trigger("selection:update",{data:a})})}),this.selection.on("open",function(){q.trigger("open")}),this.selection.on("close",function(){q.trigger("close")}),this.selection.on("toggle",function(){q.toggleDropdown()}),this.selection.on("results:select",function(){q.trigger("results:select")}),this.selection.on("results:previous",function(){q.trigger("results:previous")}),this.selection.on("results:next",function(){q.trigger("results:next")}),this.selection.on("unselected",function(a){q.trigger("unselect",a),q.trigger("close")}),this.results.on("selected",function(a){q.trigger("select",a),q.trigger("close")}),this.results.on("unselected",function(a){q.trigger("unselect",a),q.trigger("close")}),this.results.on("results:focus",function(a){q.trigger("results:focus",a)}),this.on("open",function(){g.addClass("open")}),this.on("close",function(){g.removeClass("open")}),this.data.current(function(a){q.trigger("selection:update",{data:a})}),this.on("query",function(a){this.data.query(a,function(b){q.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" aria-hidden="true"></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/src/js/select2/results.js b/src/js/select2/results.js
index 0cfd8dba..80664cc3 100644
--- a/src/js/select2/results.js
+++ b/src/js/select2/results.js
@@ -13,7 +13,7 @@ define([
 
   Results.prototype.render = function () {
     var $results = $(
-      '<ul class="options" role="listbox"></ul>'
+      '<ul class="options" role="tree"></ul>'
     );
 
     if (this.options.get('multiple')) {
@@ -86,12 +86,13 @@ define([
 
   Results.prototype.option = function (data) {
     var $option = $(
-      '<li class="option" role="option" aria-selected="false"></li>'
+      '<li class="option" role="treeitem" aria-selected="false"></li>'
     );
 
     if (data.children) {
       $option
-        .addClass('group')
+        .attr('role', 'group')
+        .attr('aria-label', data.text)
         .removeAttr('aria-selected');
 
       var $label = $('<strong class="group-label"></strong>');
@@ -147,20 +148,32 @@ define([
       self.clear();
       self.append(params.data);
 
-      self.setClasses();
+      if (container.isOpen()) {
+        self.setClasses();
+      }
     });
 
     container.on('results:append', function (params) {
       self.append(params.data);
 
-      self.setClasses();
+      if (container.isOpen()) {
+        self.setClasses();
+      }
     });
 
     container.on('select', function () {
+      if (!container.isOpen()) {
+        return;
+      }
+
       self.setClasses();
     });
 
     container.on('unselect', function () {
+      if (!container.isOpen()) {
+        return;
+      }
+
       self.setClasses();
     });
 
diff --git a/src/js/select2/selection/single.js b/src/js/select2/selection/single.js
index ecd8b076..a70d2816 100644
--- a/src/js/select2/selection/single.js
+++ b/src/js/select2/selection/single.js
@@ -48,13 +48,14 @@ define([
     });
 
     container.on('open', function () {
-      // When the dropdown is open, aria-expended="true"
+      // When the dropdown is open, aria-expanded="true"
       self.$selection.attr('aria-expanded', 'true');
     });
 
     container.on('close', function () {
-      // When the dropdown is closed, aria-expended="false"
+      // When the dropdown is closed, aria-expanded="false"
       self.$selection.attr('aria-expanded', 'false');
+      self.$selection.removeAttr('aria-activedescendant');
     });
 
     this.$selection.on('focus', function (evt) {
@@ -123,10 +124,6 @@ define([
     var formatted = this.display(selection);
 
     this.$selection.find('.rendered-selection').html(formatted);
-
-    if (data[0]._resultId != null) {
-      this.$selection.attr('aria-activedescendant', data[0]._resultId);
-    }
   };
 
   return SingleSelection;
diff --git a/src/scss/theme/default/layout.scss b/src/scss/theme/default/layout.scss
index 1b946a7c..f9415a83 100644
--- a/src/scss/theme/default/layout.scss
+++ b/src/scss/theme/default/layout.scss
@@ -85,7 +85,7 @@
 
       .options {
         .option {
-          &.group {
+          &[role=group] {
             padding: 0;
 
             .group-label {