<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
#app{
width: 200px;
height: 200px;
background-color: red;
margin: 100px auto;
}
</style>
</head>
<body>
<div id="app"></div>
<script>
const app = document.getElementById("app")
const news = app.getBoundingClientRect()
console.log(news.top,"top")
console.log(news.right,"right")
console.log(news.bottom,"bottom")
console.log(news.left,"left")
</script>
</body>
</html>
