How can PHP developers utilize CSS3 or other modern technologies to enhance user experience when opening links in new windows or tabs?

When opening links in new windows or tabs, PHP developers can utilize CSS3 or other modern technologies to enhance the user experience by adding visual cues such as animations or transitions. This can help users understand that a new window or tab has been opened and provide a smoother transition between the current page and the new one.

<a href="https://example.com" target="_blank" class="new-window-link">Open Link in New Tab</a>
```

```css
.new-window-link {
  transition: color 0.3s ease;
}

.new-window-link:hover {
  color: blue;
}