JSFiddle - React, Tailwind, and code Playground

HTML

<span class="el-a">EL-A</span>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<span class="el-b" style="display:none">EL-B</span>

CSS

.el-a,.el-b
{
  border: 2px solid black;
}

JavaScript

$('[class*=el]').hover(
     function() {  
        $('[class*=el]').each(function(){
          $(this).toggle();
        });        
    }, function() {
         $('[class*=el]').each(function(){
          $(this).toggle();
        });    
    });