--- /dev/null
+{#
+/**
+ * @file
+ * Theme override for a select element.
+ *
+ * Available variables:
+ * - attributes: HTML attributes for the select tag.
+ * - options: The option element children.
+ *
+ * @see template_preprocess_select()
+ */
+#}
+{% spaceless %}
+ <select{{ attributes }}>
+ {% for option in options %}
+ {% if option.type == 'optgroup' %}
+ <optgroup label="{{ option.label }}">
+ {% for sub_option in option.options %}
+ <option value="{{ sub_option.value }}"{{ sub_option.selected ? ' selected="selected"' }}>{{ sub_option.label }}</option>
+ {% endfor %}
+ </optgroup>
+ {% elseif option.type == 'option' %}
+ <option value="{{ option.value }}"{{ option.selected ? ' selected="selected"' }}>{{ option.label }}</option>
+ {% endif %}
+ {% endfor %}
+ </select>
+{% endspaceless %}