JSFiddle - React, Tailwind, and code Playground

HTML

<div class='seat'></div>
<div class='seat marked'></div>
<div class='seat marked'></div>
<div class='seat marked'></div>
<div class='seat'>A</div>
<div class='seat marked'></div>
<div class='seat'></div>
<div class='seat'></div>

JavaScript

var matchFound = false;
var firstInstance = false;
$('div').each(function()
{
   if($(this).hasClass('marked') && $(this).hasClass('seat'))
   {
      matchFound = true;
      firstInstance = true;
   }
   else
     matchFound = false;
     
     if(!matchFound && firstInstance)
     {
       console.log($(this).text());
       return false;
     }

});