bootstrap中看到aria-pressed="true"，它表示什么意思？

Question

bootstrap中看到aria-pressed="true"，它表示什么意思？

<a href="#" class="btn btn-primary btn-lg active" role="button" aria-pressed="true">Primary link</a>

Answer 1

Sets or retrieves the pressed state of a button that can be toggled.
设置或者检索是按下 是可以切换的

Answer 2

https://msdn.microsoft.com/en...