정답
css_float.js
var elements = document.querySelectorAll("div");
var output = document.getElementById("output");
for(var i=0; i<elements.length; i++) {
elements[i].addEventListener("click", function(event) {
console.log(this.getAttribute("id"));
output.innerHTML = "<h2>" + this.getAttribute("id") + "</h2>"
event.stopPropagation();
});
};
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