What is the difference between the box-size property content-box and border-box in the css box model?

 The box model is a very important concept in CSS layout, it includes content area, padding, border, and margin. Box models can be divided into two types: standard box models and IE box models. The box model, as the name suggests, is used to hold things, and the things it holds are the content of HTML elements. In other words, every visible HTML element is a box.

Please see the difference between the two below: border-box, content-box

<style>

        .box1{

            width: 200px;

            height: 200px;

            background-color: pink;

            border: 10px solid yellowgreen;

            padding:10px;

            box-sizing: border-box;

        }

        .box2{

            width: 200px;

            height: 200px;

            background-color: aqua;

            border: 10px solid yellowgreen;

            padding:10px;

            box-sizing: content-box;

        }

    </style>

</head>

<body>

  <div class="box1">

  </div>

  <hr>

  <div class="box2">

  </div>

After the code is executed, the result is as follows

Summary comparison:

box-sizing: content-box | border-box. The main difference between them is that the width package does not contain border and padding. The default value of box-sizing is content-box, which is the standard box model by default.