JS GetCssSelector function - Handy function to get the full CSS selector of any element in the page

get-css-selector.js

// you can include this from: https://cdn.rawgit.com/ErosLever/51c794dc1f2bab888f571e47275c85cd/raw/get-css-selector.js
/**
 * Handy function to get the full CSS selector of any element in a web page
 * @param {Element} e - the Element whose selector will be returned
 * @returns {string} s - the complete CSS Selector including all ancestors elements
 */
function getFullSelector(e){
	var s = "", t, i, c, p, n;
	do{
		t = e.tagName.toLowerCase();
		i = e.hasAttribute("id") ? "#" + e.id : "";
		c = e.hasAttribute("class") ? "." + e.className.split(/\s+/).join(".") : "";
		p = e.parentNode;
		n = Array.prototype.filter.call(e.parentNode.childNodes,function(x){
				return x.nodeType == Node.ELEMENT_NODE;
			}).indexOf(e) + 1;
		s = t + i + c + ":nth-child(" + n + ") > " + s;
	}while( !p || !(e = p).tagName.match(/^HTML$/i) );
	return s.slice(0,-3);
}

/**
 * Handy function to get the minimal CSS selector of any element in a web page
 * @param {Element} e - the Element whose selector will be returned
 * @returns {string} s - the minimal CSS Selector including its ancestors elements
 */
 function getMinSelector(e){
	var s = "", t, i, c, p, n;
	do{
		t = e.tagName.toLowerCase();
		i = e.hasAttribute("id") ? "#" + e.id : "";
		c = e.hasAttribute("class") ? "." + e.className.trim().split(/\s+/).map(x=>x.replace(/([^\w\-\_])/g,'\\$1')).join(".") : "";
		p = e.parentNode;
		n = Array.prototype.filter.call(e.parentNode.childNodes,function(x){
				return x.nodeType == Node.ELEMENT_NODE;
			}).indexOf(e) + 1;
		n = ":nth-child(" + n + ")";
		if(i && p.querySelectorAll(i).length == 1)
			s = i + " > " + s;
		else if(p.querySelectorAll(t).length == 1)
			s = t + " > " + s;
		else if(c && p.querySelectorAll(t+c).length == 1)
			s = t + c + " > " + s;
		else if(i && c && p.querySelectorAll(t+i+c).length == 1)
			s = t + i + c + " > " + s;
		else
			s = t + i + c + n + " > " + s;
	}while( !p || !(e = p).tagName.match(/^HTML$/i) );
	// try to remove parent selectors
	cs = s.slice(0,-(" > ".length)).split(" > ");
	s = cs.pop();
	while( document.querySelectorAll(s).length > 1 ){
		s = cs.pop() + " > " + s;
	}
	return s;
}

document.addEventListener('click', function(e) {
    e = e || window.event;
    var target = e.target || e.srcElement;
    console.log( getFullSelector( target ) );
    console.log( getMinSelector( target ) );
}, false);

Double checked your error, you have invalid CSS characters in your class names: bg-[#5ee5de] should not be a valid CSS class name. Although some browsers still accept it. document.querySelector requires these special character to be escaped (with a \\).
I added .replace(/([^\w\-\_])/g,'\\$1') to escape any non-alphanumeric, hyphen or underscore char.

@ErosLever Oh, sorry. Github didn't add such a timestamp (except I explicitly visit "Revisions" tab), I didn't notice that.
bg-[#5ee5de] that thing comes from tailwindcss.
Thank you for that though.

Or just use finder lib: https://github.com/antonmedv/finder/tree/master