CSS Tutorial

Detailed explanation of usage examples of focus pseudo-class in CSS

黄舟

Oct 20, 2017 am 11:07 AM

cssfocus

Detailed explanation of usage examples of focus pseudo-class in CSS;

In css: use of focus pseudo-class, that is, setting styles for elements that have received focus

Example 1

<!DOCTYPE html><html lang="en"><head>
    <meta charset="UTF-8">
    <title>:focus</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        input:focus{
            background: #cbcbcb;
        }
    </style></head><body>
    <input type="text"/></body></html>

The above uses:focus to set the style of the input box when it gets focus

Example 2

:focus is used for page navigation column, the code example is as follows:

<!DOCTYPE html><html lang="en"><head>
    <meta charset="UTF-8">
    <title>:focus</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        ul li{
            list-style: none;
            float: left;
            margin: 0 20px;
        }
        ul li a{
            text-decoration: none;
        }
        ul li a:focus{
            color: #ff290a;
        }
    </style></head><body>
    <ul>
        <li><a href="javascript:;">博客园</a></li>
        <li><a href="javascript:;">首页</a></li>
        <li><a href="javascript:;">联系</a></li>
        <li><a href="javascript:;">管理</a></li>
    </ul></body></html>

Supplement:

When the element gets the focus, if the element is a valid link, you can enter the link address by pressing the "Enter" key;

In the page, you can also use the "Tab" key to traverse all the elements that can get focus and make them focus;

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