30 seconds of CSS

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Sibling fade  interactivity

Fades out the siblings of a hovered item.

HTML
<div class="sibling-fade">
  <span>Item 1</span> <span>Item 2</span> <span>Item 3</span> <span>Item 4</span>
  <span>Item 5</span> <span>Item 6</span>
</div>
CSS
span {
  padding: 0 1rem;
  transition: opacity 0.2s;
}

.sibling-fade:hover span:not(:hover) {
  opacity: 0.5;
}
Demo
Item 1 Item 2 Item 3 Item 4 Item 5 Item 6
Explanation
  1. transition: opacity 0.2s specifies that changes to opacity will be transitioned over 0.2 seconds.
  2. .sibling-fade:hover span:not(:hover) specifies that when the parent is hovered, select any span children that are not currently being hovered and change their opacity to 0.5.
Browser support

100.0%