CSS World--Code Practice: Image Alt Information Presentation

Using the <img> element with the default src to achieve the scrolling loading effect, however, there may be such an experience problem: if our JavaScript loads slowly, our page is likely to have patches of white image areas, pure white, without any information, and the user has no idea what the content is.
Although the alt attribute can provide descriptive information, it is hidden due to poor visual effects. We can display the alt information before the image is loaded:

<!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>CSS World--Code Practice--Image Alt Information Presentation</title>
        <style>
            /* Scrolling loading effect CSS */
            /* img {
                visibility: hidden;
            }

            img[src] {
                visibility: visible;
            } */

            img {
                display: inline-block;
                width: 180px;
                height: 100px;
                /* Hide Firefox alt text */
                color: transparent;
                position: relative;
                overflow: hidden;
            }

            img:not([src]) {
                /* Hide Chrome alt text and silver border */
                visibility: hidden;
            }

            img::before {
                /* Light blue background */
                content: "";
                position: absolute;
                left: 0;
                width: 100%;
                height: 100%;
                background-color: #f0f3f9;
                visibility: visible;
            }

            img::after {
                /* Black alt information bar*/
                content: attr(alt);
                position: absolute;
                left: 0;
                bottom: 0;
                width: 100%;
                line-height: 30px;
                background-color: rgba(0, 0, 0, .5);
                color: white;
                font-size: 14px;
                transform: translateY(100%);
                /* Add some transition animation effects*/
                transition: transform .2s;
                visibility: visible;
            }


            img:hover::after {
                transform: translateY(0);
            }

        </style>
    </head>

    <body>
        <div style="width: 200px;height: 200px;background: blanchedalmond;overflow: auto;">
            <!-- Scrolling loading effect HTML: -->
            <!-- <img> -->
            <img alt="图1" src="https://dss3.bdstatic.com/70cFv8Sh_Q1YnxGkpoWK1HF6hhy/it/u=3791918726,2864900975&fm=26&gp=0.jpg">
            <img alt="Beautiful woman meditating" data-src="1.jpg">
            <img alt="图3" src="https://dss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2853553659,1775735885&fm=26&gp=0.jpg">
            <img alt="Meditation Picture" data-src="1.jpg">
        </div>
    </body>
    <script>

    </script>

</html>

Operation effect:

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