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bootstrap выпадающее меню


aqua.77
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Нашел в бутстрапе выпадающее меню с кнопкой, при нажатии на которой внешний контейнер родитель добавляет себе класс "open".  Вот свойства батома 

<button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown" aria-expanded="false">Выпадающий список
</button>

aria-expanded="false" при нажатии меняется на false true и внешний блок добавляет и удаляет себе класс соответственно. Как так происходит? это без JS? как такого добиться?

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