html - 根据列表元素的数量为 li 第一个 child 设置不同的边距

Question

<分区>

Answer 1

DEMO

styles can be applied to the children nodes based on the number of siblings they have.

html

<ul>
    <li>one item</li>
</ul>

<ul>
    <li>two items</li>
    <li>two items</li>
</ul>

<ul>
    <li>three items</li>
    <li>three items</li>
    <li>three items</li>
</ul>

<ul>
    <li>four items</li>
    <li>four items</li>
    <li>four items</li>
    <li>four items</li>
</ul>

CSS

 li:first-child:nth-last-child(1) {
    margin-left: 0px;
}

li:first-child:nth-last-child(2) ~ li {
    margin-left: 0px;
}

li:first-child:nth-last-child(3) ~ li {
    margin-left: 0px;
}

li:first-child:nth-last-child(4) ~ li {
    margin-left: 0px;
}

 li:first-child:nth-last-child(4) {
     margin-left:10px;
    color:red;
 }

 li:first-child:nth-last-child(3) {
     margin-left:20px;
    color:green;
 }

 li:first-child:nth-last-child(2) {
     margin-left:30px;
    color:blue;
 }

 li:first-child:nth-last-child(1) {
     margin-left:40px;
     color:gray;
 }

引用:Can CSS detect the number of children an element has?