Bootstrap5 屏幕阅读器（Screen readers）

除screen readers（屏幕阅读器），对所有设备使用.visually-hidden来隐藏一个元素。使用.visually-hidden-focusable仅在元素被聚焦时（例如，仅键盘用户）才显示该元素。也可以使用mixin。

<h2 class="visually-hidden">Title for screen readers</h2>
<a class="visually-hidden-focusable" href="#content">Skip to main content</a>
<div class="visually-hidden-focusable">A container with a <a href="#">focusable element</a>.</div>

在线运行

// Usage as a mixin

.visually-hidden-title {
  @include visually-hidden;
}

.skip-navigation {
  @include visually-hidden-focusable;
}