Edit fiddle - JSFiddle - React, Tailwind, and code Playground

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

JavaScript

var itemsInQueue = $('.marked').nextUntil(":not(.marked)").length;
 var totalMarkedItems =  $('.marked').length - 1;
alert(itemsInQueue);
alert(totalMarkedItems);

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JSFiddle - React, Tailwind, and code Playground

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