CSS选择器基础 - 二十二期作业

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展示基本,上下文,伪类(结构,状态)选择器

基本选择器

上下文选择器

父子 : >

后代: 空格

兄弟: +

同级: ~

伪类选择器

结构伪类

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        ul>li:first-child {
            color: blue;
        }
        ul>li:last-child{
            color: red;
        }
        ul>li:nth-child(2n+1){
            background-color: aquamarine;
        }
        ul>li:nth-last-child(2n+2){
            background-color: violet;
        }
    </style>
</head>
<body>
    <ul>
        <li>item1</li>
        <li>item2</li>
        <li>item3</li>
        <li>item4</li>
        <li>item5</li>
    </ul>
</body>
</html>

效果图

状态伪类

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <form action="">
        <fieldset>
          <legend>用户注册</legend>
            <input type="text" id="username" name="username" placeholder="用户名" required autofocus />
            <input type="email" id="email" name="email" placeholder="邮箱" required disabled />
            <input type="password" id="password" name="password" placeholder="密码" required />
            <div>
            <input type="checkbox" id="rem" name="remember" checked />
            <label for="rem">记住我</label>
            </div>
          <button>提交</button>
        </fieldset>
      </form>
    </body>
  </html>
</body>
</html>

fieldset {
    display: inline-grid;
    gap: 1em;
    border-radius: 10px;
    padding: 1em 2em;
    color: #666;
    background: linear-gradient(to left top, lightcyan, white);
  }
  fieldset legend {
    text-align: center;
  }
  fieldset input {
    padding: 5px;
    border: none;
    border-bottom: 1px solid #666;
    outline: none;
    background-color: transparent;
  }
  button:hover {
    cursor: pointer;
    opacity: 0.9;
  }
  fieldset :disabled {
    background-color: orange;
  }
  input[type="checkbox"]:checked+label {
    color: red;
  }
  fieldset :focus {
    background-color: lightpink;
  }

效果展示

Correcting teacher：

PHPz

Correction status：qualified

Teacher's comments：

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