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How can I resolve conflicts between CSS animations and JavaScript-triggered DOM updates in a web app?

Asked on Dec 16, 2025

Answer

To resolve conflicts between CSS animations and JavaScript-triggered DOM updates, you can use the "animationend" event to synchronize JavaScript actions with the completion of CSS animations. Here's an example:

<!-- BEGIN COPY / PASTE -->
        <style>
            .animate {
                animation: fadeIn 2s forwards;
            }

            @keyframes fadeIn {
                from { opacity: 0; }
                to { opacity: 1; }
            }
        </style>

        <div id="myElement" class="animate">Hello, World!</div>

        <script>
            const element = document.getElementById('myElement');

            element.addEventListener('animationend', () => {
                console.log('Animation completed!');
                // Perform JavaScript DOM updates here
                element.textContent = 'Animation Finished!';
            });
        </script>
        <!-- END COPY / PASTE -->

Additional Comment:

The "animationend" event listener is attached to the element with the CSS animation.
When the animation completes, the listener triggers a JavaScript function to update the DOM.
This approach ensures that JavaScript updates occur only after the CSS animation has finished.

✅ Answered with JavaScript best practices.

Ask any question about JavaScript here... and get an instant response.

How can I resolve conflicts between CSS animations and JavaScript-triggered DOM updates in a web app?

Asked on Dec 16, 2025

Answer

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