JSFiddle - React, Tailwind, and code Playground
HTML
<a class="one a" href="">link 1</a>
<a class="one b" href="">link 2</a>
<a class="one c" href="">link 3</a>
<a class="one d" href="">link 4</a>
<a class="one e" href="">link 5</a>
CSS
a { display:block;}
.d,.e { display:none; }
JavaScript
$('.one:visible').css('background-color','yellow'); //works
alert($('.one:visible').length);