htmx/www/extensions/class-tools.md

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The class-tools Extension

The class-tools extension allows you to specify CSS classes that will be swapped onto or off of the elements by using a classes or data-classes attribute. This functionality allows you to apply CSS Transitions to your HTML without resorting to javascript.

A classes attribute value consists of "runs", which are separated by an & character. All class operations within a given run will be applied sequentially, with the delay specified.

Within a run, a , character separates distinct class operations.

A class operation is an operation name add, remove, or toggle, followed by a CSS class name, optionally followed by a colon : and a time delay.

Usage

<div hx-ext="class-tools">
    <div classes="add foo"/> <!-- adds the class "foo" after 100ms -->
    <div class="bar" classes="remove bar:1s"/> <!-- removes the class "bar" after 1s -->
    <div class="bar" classes="remove bar:1s, add foo:1s"/> <!-- removes the class "bar" after 1s
                                                                then adds the class "foo" 1s after that -->
    <div class="bar" classes="remove bar:1s & add foo:1s"/> <!-- removes the class "bar" and adds 
                                                                 class "foo" after 1s  -->
    <div classes="toggle foo:1s"/> <!-- toggles the class "foo" every 1s -->
</div> 

Source

https://unpkg.com/htmx.org/dist/ext/class-tools.js