App001/flex.html at master · xyzdata/App001 · GitHub

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<!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>
    <!--
        https://developer.mozilla.org/zh-CN/docs/Web/CSS/CSS_Flexible_Box_Layout/Using_CSS_flexible_boxes
        http://learnlayout.com/flexbox.html
        https://css-tricks.com/snippets/css/a-guide-to-flexbox/
    -->
    <style>
        .container {
            display: -webkit-flex;
            display: flex;
            border: 1px solid red;
            box-sizing: border-box;
            overflow: hidden;
        }

        .initial {
            -webkit-flex: initial;
            flex: initial;
            width: 300px;
            max-width: 300px;
            box-sizing: border-box;
            background: #0f0;
            transition: all ease-out 0.5s 0.1s;
        }

        @media all and (max-width: 720px) {
            .initial {
                -webkit-flex: initial;
                flex: initial;
                width: 50px;
                max-width: 50px;
                box-sizing: border-box;
                background: #ccc;
                transition: all ease-in 0.5s 0.1s;
                color: aquamarine;
            }
        }

        .none {
            -webkit-flex: none;
            flex: none;
            width: 200px;
        }

        .flex1 {
            -webkit-flex: 1;
            flex: 1;
            box-sizing: border-box;
            background: #f0f;
        }

        .flex2 {
            -webkit-flex: 2;
            flex: 2;
        }
    </style>
</head>

<body>
    <h1>flex</h1>
    <hr>
    <div class="container">
        <nav class="initial">
            <ul>
                <li>li1</li>
                <li>li2</li>
                <li>li3</li>
            </ul>
        </nav>
        <section class="flex1">
            flex 1
        </section>
    </div>
</body>

</html>