/CSS/What does class="d-none d-md-block" mean in bootstrap?

What does class="d-none d-md-block" mean in bootstrap?

Bootstrap display inline block

<div class="d-inline-block"></div>

Display sm none

Hidden on all	.d-none
Hidden only on xs	.d-none .d-sm-block
Hidden only on sm	.d-sm-none .d-md-block
Hidden only on md	.d-md-none .d-lg-block
Hidden only on lg	.d-lg-none .d-xl-block
Hidden only on xl	.d-xl-none
Visible on all	.d-block
Visible only on xs	.d-block .d-sm-none
Visible only on sm	.d-none .d-sm-block .d-md-none
Visible only on md	.d-none .d-md-block .d-lg-none
Visible only on lg	.d-none .d-lg-block .d-xl-none
Visible only on xl	.d-none .d-xl-block

Source: getbootstrap.com

What does class="d-none d-md-block" mean in bootstrap?

<li class="d-none d-sm-block">

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