JSFiddle - React, Tailwind, and code Playground

HTML

<div id="parent">
       <div></div>
       <div></div>
       <div id="whereami"></div>
       <div></div>
    </div>

JavaScript

function findRow(node){
        var i=1;
        while(node.previousSibling){
            node = node.previousSibling;
            if(node.nodeType === 1){
                   i++;
            }
        }
        return i; //Returns 3
    }

    var node = document.getElementById('whereami'); //div node to find
    var count = findRow(node);
    alert(count);