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Add note about class matching in animation selector #234

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daun merged 1 commit into from
Feb 17, 2026
Merged

Add note about class matching in animation selector #234

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8 changes: 7 additions & 1 deletion src/docs/options/options.md
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Expand Up @@ -44,14 +44,20 @@ const swup = new Swup({

The selector for detecting animation timing. Swup will wait for all CSS transitions and
keyframe animations to finish on these elements before swapping in the content of the new page.
The default option will select all elements with class names beginning in `transition-`.
The default option will select all elements with class names containing `transition-`.

```javascript
{
animationSelector: '[class*="transition-"]'
}
```

> [!NOTE] Note about class matching
> Technically, the `*=` comparison in the selector will include classes containing the
> pattern at any position, such as `my-transition-class`. To avoid this, consider using a stricter
> selector, e.g. `class^="transition-"]` which would require the transition class to come at the
> beginning of the class attribute, or `class~="transition-fade"` to target a specific transition class.

## animationScope

The elements on which swup will add the [animation classes](/getting-started/how-it-works/#animation-classes)
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