lovecoding
/
W250511


			
				
					
						
						
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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">
    <title>Document</title>
    <style>
        /* 并且/并列 */
        .box.div1{
            color: red;
        }

        /* + 选中紧跟在后边的兄弟元素 */
        /* .li1+li{
            color: red;
        } */
         /* ~ 选中后边所有的兄弟 */
        .li1~li{
            color: red;
        }
        .box2{
            width: 400px;
            height: 400px;
            border:1px solid black
        }
        .box3{
            width: 300px;
            height: 300px;
            border:1px solid red;
        }
        .box4{
            width: 200px;
            height: 200px;
            border:1px solid blue;
        }

        /* > 子代选择器 */
        .box2 > div{
            border:1px solid green;
        }
    </style>
</head>
<body>
    <div class="box div1"> hello world </div>
    <div class="box"> 你好世界</div>
    <div class="div1">爱扣钉</div>

    <ul>
        <li>项目一</li>
        <li class="li1">项目二</li>
        <li>项目三</li>
        <li>项目四</li>
        <li>项目五</li>
        <li>项目六</li>
    </ul>

    <div class="box2">
        <div class="box3">
            <div class="box4"></div>
        </div>
    </div>
</body>
</html>