JSFiddle - React, Tailwind, and code Playground
HTML
<div class="element ele-one">Element ONE</div>
<div class="element ele-two">Element TWO</div>
CSS
.ele-one {display: none}
JavaScript
if ($('.ele-one').is(':visible')) {
//if (!$('.ele-one').css('display') === 'none') {
$('.ele-two').html("Hello World");
} else {
$('.ele-two').html("Goodbye World");
}