CSS: offsetWidth offsetHeight clientWidth clientHeight scrollWidth scrollHeight

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            margin: 20px;
            width: 200px;
            height: 300px;
            background-color: peru;
            border: 10px dotted magenta;
            /* border-bottom-width: 50px; */
            padding: 20px;
        }

        section {
            background-color: plum;
            width: 100px;
            height: 200px;
            /* overflow: scroll; */
            /* overflow-y: hidden; */
            overflow: auto;
            border: 10px dashed teal;
            /* border-top-width: 50px; */
            padding: 20px;
        }

        body {
            background-color: aqua;
            height: 1500px;
            width: 1500px;
        }

        html {
            background-color: tan;
            border: 10px dashed maroon;
            padding: 20px;
        }
    </style>
</head>

<body>
    <section>
        <div></div>
    </section>
    <script>
        const section = document.querySelector('section')
        const div = document.querySelector('div')
    </script>
</body>

</html>

View Code

document.documentElement水平和垂直表现不一样

scrollWidth = 10 + 20 + 8 + 1500

scrollHeight = offsetHeight = (10 + 20) * 2 + 8 * 2 + 1500 = 1576

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        html,
        body {
            height: 100%;
        }

        div {
            width: 300px;
            height: 500px;
            margin: 30px;
            border: 20px dashed violet;
            padding: 40px;
            background-color: plum;
            position: relative;
            overflow-x: scroll;
            overflow-y: scroll;
            display: flow-root;
        }

        aside {
            width: 100px;
            height: 800px;
            background-color: peru;
            position: absolute;
            margin: 10px;
            padding: 20px;
            border: 30px dotted coral;
            top: 50px;
        }
    </style>
</head>

<body>
    <div>
        <aside></aside>
    </div>
    <script>
        const div = document.querySelector('div')
        const aside = document.querySelector('aside')
    </script>
</body>

</html>

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        div {
            margin: 20px;
            width: 200px;
            height: 300px;
            background-color: peru;
            border: 10px dotted magenta;
            /* border-bottom-width: 50px; */
            padding: 20px;
        }

        section {
            background-color: plum;
            width: 100px;
            height: 200px;
            /* overflow: scroll; */
            /* overflow-y: hidden; */
            overflow: auto;
            border: 10px dashed teal;
            /* border-top-width: 50px; */
            padding: 20px;
        }

        body {
            background-color: aqua;
            height: 500px;
            width: 500px;
            border: 10px dotted crimson;
            padding: 20px;
        }

        html {
            background-color: tan;
            border: 10px dashed maroon;
            padding: 20px;
            width: 400px;
            height: 400px;
        }
    </style>
</head>

<body>
    <section>
        <div></div>
    </section>
    <script>
        const section = document.querySelector('section')
        const div = document.querySelector('div')
    </script>
</body>

</html>