Add role="button" to chosen-single class link

JJJ#52

coffee/chosen.proto.coffee

@@ -8,7 +8,7 @@ class @Chosen extends AbstractChosen
     super()
 
     # HTML Templates
-    @single_temp = new Template('<a class="chosen-single chosen-default"><span>#{default}</span><div><b></b></div></a><div class="chosen-drop"><div class="chosen-search"><input type="text" autocomplete="off" aria-expanded="false" aria-haspopup="true" role="combobox" aria-autocomplete="list" /></div><ul class="chosen-results" role="listbox" aria-busy="true"></ul></div>')
+    @single_temp = new Template('<a class="chosen-single chosen-default" role="button"><span>#{default}</span><div><b></b></div></a><div class="chosen-drop"><div class="chosen-search"><input type="text" autocomplete="off" aria-expanded="false" aria-haspopup="true" role="combobox" aria-autocomplete="list" /></div><ul class="chosen-results" role="listbox" aria-busy="true"></ul></div>')
     @multi_temp = new Template('<ul class="chosen-choices"><li class="search-field"><input type="text" value="#{default}" class="default" autocomplete="off" aria-expanded="false" aria-haspopup="true" role="combobox" aria-autocomplete="list" style="width:25px;" /></li></ul><div class="chosen-drop"><ul class="chosen-results" role="listbox" aria-busy="true"></ul></div>')
     @no_results_temp = new Template('<li class="no-results">' + @results_none_found + ' "<span>#{terms}</span>"</li>')
 

coffee/lib/abstract-chosen.coffee

@@ -453,7 +453,7 @@ class AbstractChosen
 
   get_single_html: ->
     """
-      <a class="chosen-single chosen-default">
+      <a class="chosen-single chosen-default" role="button">
         <span>#{@default_text}</span>
         <div><b></b></div>
       </a>

docs/chosen.jquery.js

@@ -2,7 +2,7 @@
 Chosen, a Select Box Enhancer for jQuery and Prototype
 Version 2.2.1
 Full source at https://github.com/jjj/chosen
-Copyright (c) 2011-2022 JJJ
+Copyright (c) 2011-2023 JJJ
 MIT License, https://github.com/jjj/chosen/blob/master/LICENSE.md
 This file is generated by `grunt build`, do not edit it by hand.
 */
@@ -897,7 +897,7 @@ This file is generated by `grunt build`, do not edit it by hand.
       }
 
       get_single_html() {
-        return `<a class="chosen-single chosen-default">
+        return `<a class="chosen-single chosen-default" role="button">
   <span>${this.default_text}</span>
   <div><b></b></div>
 </a>

docs/chosen.proto.js

@@ -2,7 +2,7 @@
 Chosen, a Select Box Enhancer for jQuery and Prototype
 Version 2.2.1
 Full source at https://github.com/jjj/chosen
-Copyright (c) 2011-2022 JJJ
+Copyright (c) 2011-2023 JJJ
 MIT License, https://github.com/jjj/chosen/blob/master/LICENSE.md
 This file is generated by `grunt build`, do not edit it by hand.
 */
@@ -897,7 +897,7 @@ This file is generated by `grunt build`, do not edit it by hand.
       }
 
       get_single_html() {
-        return `<a class="chosen-single chosen-default">
+        return `<a class="chosen-single chosen-default" role="button">
   <span>${this.default_text}</span>
   <div><b></b></div>
 </a>
@@ -971,7 +971,7 @@ This file is generated by `grunt build`, do not edit it by hand.
       set_default_values() {
         super.set_default_values();
         // HTML Templates
-        this.single_temp = new Template('<a class="chosen-single chosen-default"><span>#{default}</span><div><b></b></div></a><div class="chosen-drop"><div class="chosen-search"><input type="text" autocomplete="off" aria-expanded="false" aria-haspopup="true" role="combobox" aria-autocomplete="list" /></div><ul class="chosen-results" role="listbox" aria-busy="true"></ul></div>');
+        this.single_temp = new Template('<a class="chosen-single chosen-default" role="button"><span>#{default}</span><div><b></b></div></a><div class="chosen-drop"><div class="chosen-search"><input type="text" autocomplete="off" aria-expanded="false" aria-haspopup="true" role="combobox" aria-autocomplete="list" /></div><ul class="chosen-results" role="listbox" aria-busy="true"></ul></div>');
         this.multi_temp = new Template('<ul class="chosen-choices"><li class="search-field"><input type="text" value="#{default}" class="default" autocomplete="off" aria-expanded="false" aria-haspopup="true" role="combobox" aria-autocomplete="list" style="width:25px;" /></li></ul><div class="chosen-drop"><ul class="chosen-results" role="listbox" aria-busy="true"></ul></div>');
         return this.no_results_temp = new Template('<li class="no-results">' + this.results_none_found + ' "<span>#{terms}</span>"</li>');
       }