Implementing interesting visuals when elements hover, such as moving elements, is very simple. But if there are multiple list items and you want the movement of each list item to have an interlaced animation time, how can you achieve it?

The following code shows how to achieve interleaved animation effect through the transition-delay attribute. First, we select each list item and apply a different delay time:

 @media (hover: hover) {
  .list li a span {
    transform: translateY(100px);
    transition: 0.2s;
  }
  .list:hover span {
    transform: translateY(0);
  }
  .list li:nth-child(1) span {
    transition-delay: 0s;
  }
  .list li:nth-child(2) span {
    transition-delay: 0.05s;
  }
  .list li:nth-child(3) span {
    transition-delay: 0.1s;
  }
  .list li:nth-child(4) span {
    transition-delay: 0.15s;
  }
  .list li:nth-child(5) span {
    transition-delay: 0.2s;
  }
  .list li:nth-child(6) span {
    transition-delay: 0.25s;
  }
}

For more flexible control of latency, you can use CSS to customize properties:

 @media (hover: hover) {
  .list {
    --delay: 0.05s;
  }
  .list li a span {
    transform: translateY(100px);
    transition: 0.2s;
  }
  .list:hover span {
    transform: translateY(0);
  }
  .list li:nth-child(n) span {
    transition-delay: calc(var(--delay) * (n - 1));
  }
}

This method uses the calc() function to dynamically calculate the delay time, making the code simpler and easier to scale. n represents the sequence number of the list item.

If the list items are large, the above methods may appear redundant. You can use Sass loop to generate code:

 @media (hover: hover) {
  .list li a span {
    transform: translateY(100px);
    transition: 0.2s;
  }
  .list:hover span {
    transform: translateY(0);
  }
  @for $i from 0 through 20 {
    .list li:nth-child(http://miracleart.cn/link/93ac0c50dd620dc7b88e5fe05c70e15b{$i 1}) span {
      transition-delay: 0.05s * $i;
    }
  }
}

This Sass code loops to generate transition-delay attributes of 21 list items. Even if there are fewer than 21 list items, the excess code will be effectively reduced after gzip compression.

Finally, you can also pass the delay value from HTML:

 <!-- HTML structure example->
<ul class="list">
  <li><a href="http://miracleart.cn/link/93ac0c50dd620dc7b88e5fe05c70e15b"><span style="--delay: 0s;">This</span></a></li>
  <li><a href="http://miracleart.cn/link/93ac0c50dd620dc7b88e5fe05c70e15b"><span style="--delay: 0.05s;">Little</span></a></li>
  <!-- ... more list items ... -->

@media (hover: hover) {
  .list li a span {
    transform: translateY(100px);
    transition: 0.2s;
  }
  .list:hover span {
    transform: translateY(0);
    transition-delay: var(--delay); /* Get delay value from HTML*/
  }
}

Which method to choose depends on the specific needs of the project and personal preferences. The Sass loop method has advantages in maintainability and scalability, while the custom attribute method is more concise and flexible. It is also convenient to set directly in HTML, but may not be very convenient for maintenance.

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