u-visually-hide

I'm invisible, yet accessible!

Code 
<p class="u-visually-hide">I'm invisible, yet accessible!</p>

u-hide@lteLine

I don't exist at smaller screens!

Code 
<p class="u-hide@lteLine">I don't exist at smaller screens!</p>

u-hide@gtLine

I don't exist at larger screens!

Code 
<p class="u-hide@gtLine">I don't exist at larger screens!</p>

u-hide-if-js

I don't exist if JavaScript is available!

Code 
<p class="u-hide-if-js">I don't exist if JavaScript is available!</p>