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+### sibling-fade
+
+Fade out siblings around a hovered item
+
+#### HTML
+
+```html
+<nav>
+  <a href="#">Item 01</a>
+  <a href="#">Item 02</a>
+  <a href="#">Item 03</a>
+  <a href="#">Item 04</a>
+  <a href="#">Item 05</a>
+  <a href="#">Item 06</a>
+</nav>
+```
+
+#### CSS
+
+```css
+nav {
+  cursor: default;
+  display: flex;
+}
+
+a {
+  color: #333;
+  font-weight: bold;
+  font-family: sans-serif;
+  text-decoration: none;
+  padding: 8px 16px;
+  transition: opacity 0.2s;
+}
+
+nav:hover a:not(:hover) {
+  opacity: 0.4;
+}
+```
+
+#### Demo
+
+#### Explanation
+
+1. `display: flex ` enables flexbox.
+2. `transition: opacity 0.2s` means changes to opacity will be transitioned over 0.2 seconds.
+3. `nav:hover a:not(:hover)` changes the opacity of un-hover childs to 0.4.
+
+#### Browser support
+✅ No caveats.