JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
<div class="container">
  <div class="someblock">&nbsp;</div>
</div>

CSS

.container {
  height: 1000px;  
}

.someblock {
  margin-top: 200px;
  background: #000;
}

JavaScript

$(window).on('scroll', function(){
		console.log($(window).scrollTop() - $('.someblock').offset().top);
});