5분 안에 CSS 의사 클래스 선택기를 이해하세요: is :not

<div>
    <span>我是蓝色</span>
    <p>我是黑色</p>
    <h1>我是蓝色</h2>
    <h2>我是蓝色</h2>
    <h3>我是蓝色</h3>
    <h4>我是蓝色</h4>
    <h5>我是蓝色</h5>
</div>

div span,div h2,div h3, div h4,{
  color: blue;
}

div:not(p){
  color: blue;
}

div:not(p):not(span){
  color: blue;
}

div:not(p,span){
  color: blue;
}

<header>
  <ul>
    <li><p>鼠标放上去变蓝色</p></li>
    <li><p>鼠标放上去变蓝色</p></li>
  </ul>
  <p>正常字体</p>
</header>
<main>
  <ul>
    <li><p>鼠标放上去变蓝色</p></li>
    <li><p>鼠标放上去变蓝色</p></li>
    <p>正常字体</p>
  </ul>
</main>
<footer>
  <ul>
    <li><p>正常字体</p></li>
    <li><p>正常字体</p></li>
  </ul>
</footer>

header ul p:hover,main ul p:hover{
  color: blue;
}

:is(header, main) ul p:hover{
  color: blue;
}

/* Level 0 */
h1 {
  font-size: 30px;
}
/* Level 1 */
section h1, article h1, aside h1, nav h1 {
  font-size: 25px;
}
/* Level 2 */
section section h1, section article h1, section aside h1, section nav h1,
article section h1, article article h1, article aside h1, article nav h1,
aside section h1, aside article h1, aside aside h1, aside nav h1,
nav section h1, nav article h1, nav aside h1, nav nav h1 {
  font-size: 20px;
}

/* Level 0 */
h1 {
  font-size: 30px;
}
/* Level 1 */
:is(section, article, aside, nav) h1 {
  font-size: 25px;
}
/* Level 2 */
:is(section, article, aside, nav)
:is(section, article, aside, nav) h1 {
  font-size: 20px;
}

:-moz-any(.b, .c) {
}
:-webkit-any(.b, .c) { 
}