JSFiddle - React, Tailwind, and code Playground

HTML

<span></span>
<div></div>

CSS

div {
    margin-top: 300px;
    background-color: #000;
    width: 200px;
    height: 200px;
}

JavaScript

$(function() {
    var offset = $("div").offset(),
        top = offset.top;
    
    $('span').text('расстояние от верха = ' + top + 'px');
});