footer置底时，整个页面超出了浏览器高度的原因?

发布于
2023-07-11 陕西

更新于
2023-07-12

设备信息和错误图片

chrome: 114.0.5735.199 (正式版本) （64 位） (cohort: Stable)
图片是与下处同一个代码所得:

html和body以及div#wrapper都是1034*1020,不过html在页面一加载就会占据整个视窗，div#wrapper和body相比html边缘部分多出了h1.title的marginTop，占据的空间是从marginTop到浏览器最底下的.
html是占据

参考https://segmentfault.com/a/1190000008516654第一种方法让footer置底，但是出现了滚动条，溢出了。看了元素的盒子模型是符合浏览器高度的.

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

<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>css lessons</title>
    <style>
        * {
            font-family: myfont, Arial, Helvetica, sans-serif;
        }

        html,
        body {
            margin: 0;
            padding: 0;
            height: 100%;
        }

        body {
            background-color: lightblue;
        }

        h1 {
            text-align: center;
            text-transform: uppercase;
            letter-spacing: 1rem;
            font-weight: bolder;
            text-shadow: 1px 2px 3px lightslategray;
        }

        span {
            font-size: large;
            letter-spacing: normal;
            font-weight: normal;
        }

        /* CONTAINER */
        #container {
            width: 1000px;
            height: 400px;
            background-color: #4524FB;
            margin: 80px auto;
            border-radius: 20px;
            display: flex;
            flex-direction: row;
        }

        .item1,
        .item2,
        .item3 {
            width: 100px;
            height: 50px;
            background-color: lime;
            border-radius: 10px;
            text-align: center;
            /* line-height和height相等时文本居中 */
            line-height: 50px;
            font-weight: bolder;
        }

        #wrapper {
            min-height: 100%;
            margin-bottom: -60px;
        }

        .placeholder,
        footer {
            height: 60px;
        }

        footer {
            background-color: lightslategray;
        }
    </style>
</head>

<body>
    <div id="wrapper">
        <h1 class="title"><span>The Complete Guide to</span> <br>CSS Flexbox</h1>

        <div id="container">
            <div class="item1">1</div>
            <div class="item2">2</div>
            <div class="item3">3</div>
        </div>
        <div class="placeholder"></div>
    </div>

    <footer>
        <span class="copyright">Posted by: Clarence</span>
        <p class="info">
            <span id="email">email: xxxxxx</span>
            <span id="website">website: <a>xxxxxx</a></span>
        </p>
    </footer>
</body>

</html>