<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <link href="aaa.css" rel="stylesheet">

</head>
  
<body>
    <section></section>
    <section></section>
</body>

</html>
section {
    width: 600px;
    height: 200px;
}

section:nth-of-type(1){
    background-color: red;
}

section:nth-of-type(2){
   background-color: blue;
  position:relative;
  left : 100px;
  top : -100px;
}
const arr = [];

console.time('array');
for(let i = 0; i < 1000000; i++){
  arr[i] = i;
}
console.timeEnd('array');

const obj = {};

console.time('object');
for(let i = 0; i < 1000000; i++){
  obj[i] = i;
}
console.timeEnd('object')

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.