Bhudh

let parent = target.parentNode;
while ( parent ) {
    if ( parent.tagName === 'A' ) {
        break;
    }
    parent = parent.parentNode;
}

if ( parent !== null ) {
     // target внутри ссылки, обрабатывайте
}

function pad(n){
	return n.length<2?'0'+n:n;
}
function rndHex(){
	var base = 16,
		resultNum = Math.floor(Math.random()*base*base).toString(base);
	return pad(resultNum);
}
function rndHexColor(){
	return'#'+rndHex()+rndHex()+rndHex();
}
function changeColor(){
	this .style.backgroundColor=rndHexColor();
}

document.getElementById('ID_of_element').addEventListener('mouseenter', changeColor);