angularjs - What is md-visually-hidden used for? -


in angular material design, see md-visually-hidden in codepen form developer team.

it used this:

<button ng-click="togglesidenav('left')" hide-gt-sm class="md-icon-button menubtn">   <span class="md-visually-hidden">menu</span> </button>

is hides content, purpose of adding , hiding text "menu"? guess point not replace html commenting...

i suspect used screen readers. context, there comment fragment has md-visually-hidden class.


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