滑动进入动画

示例

scss 实现：将 id content_html 内子元素添加滑动进入动画

#content_html {
  margin-top: 20px;
  padding: 0 15px;

  p,
  li {
    margin: 15px 0;
    font-size: 16px;
    line-height: 25px;
  }

  ul,
  li {
    list-style: inside;
  }

  h1,
  h2,
  h3,
  h4,
  h5,
  h6 {
    font-size: 19px;
    font-weight: 700;
    letter-spacing: -0.025rem;
    line-height: 1.8rem;
    margin: 20px 0;
    outline: none;
  }

  h2 {
    font-size: 18px;
  }

  h3 {
    font-size: 17px;
  }

  h4,
  h5,
  h6 {
    font-size: 16px;
  }

  @keyframes slide-enter {
    0% {
      opacity: 0;
      transform: translateY(10px);
    }

    to {
      opacity: 1;
      transform: none;
    }
  }

  * {
    --stagger: 0;
    --delay: 150ms;
    --start: 0ms;
    animation: slide-enter 1s both 1;
    animation-delay: calc(var(--start) + var(--stagger) * var(--delay));
  }

  * {
    counter-increment: enter-count;
    --stagger: counter(enter-count);
  }

  .slide-enter-content > * {
    --stagger: 0;
    --delay: 150ms;
    --start: 0ms;
    animation: slide-enter 1s both 1;
    animation-delay: calc(var(--start) + var(--stagger) * var(--delay));
  }

  @for $i from 1 through 30 {
    *:nth-child(#{$i}) {
      --stagger: #{$i};
    }
  }
}

参考-antfu