Event Target

Events can be trigered by different elements. 
const h1Element = document.querySelector("h1");
const boxElement = document.querySelector(".box");
h1Element.addEventListener('click', actionTitleClick );
boxElement.addEventListener('click', actionBoxClick ); 

function actionTitleClick(event) {
  h1Element.textContent = "Title clicked !";
}

function actionBoxClick(event) {
  boxElement.style = "background-color: blue;";
}