CSS Animation Example: Staggered List Slide

The "Staggered List Slide" creates an organized, cascading entrance for menu items, guiding the user's eye down the list.

Dashboard
Profile
Settings
Logout

This animation utilizes a single @keyframes block that animates opacity and transform: translateX(). However, the secret sauce is applying an increasing animation-delay to each sequential list item using the :nth-child() pseudo-class. When a parent class (like .show) is added via JavaScript, all items begin their animation sequence, but uniquely delayed.

Here is the code to create the Staggered List Slide animation.

<!doctype html>
<title>Example</title>
<style>
body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: sans-serif;
    background-color: #f0f0f0;
}

.staggered-list {
    list-style: none;
    padding: 0;
    margin: 0;
    width: 200px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    overflow: hidden;
}

.staggered-list li {
    padding: 15px 20px;
    border-bottom: 1px solid #eee;
    opacity: 0;
    transform: translateX(-20px);
}

.staggered-list li:last-child {
    border-bottom: none;
}

/* The .show class will be toggled by JS on the parent <ul> */
.staggered-list.show li {
    animation: slideIn 0.4s ease forwards;
}

.staggered-list.show li:nth-child(1) { animation-delay: 0.1s; }
.staggered-list.show li:nth-child(2) { animation-delay: 0.2s; }
.staggered-list.show li:nth-child(3) { animation-delay: 0.3s; }
.staggered-list.show li:nth-child(4) { animation-delay: 0.4s; }

@keyframes slideIn {
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@media (prefers-reduced-motion: reduce) {
    .staggered-list.show li {
        animation: simpleFade 0.3s ease forwards;
    }
    
    @keyframes simpleFade {
        to { opacity: 1; transform: translateX(-20px); }
    }
}
</style>

<div>
    <button onclick="document.getElementById('demoList').classList.toggle('show');" style="margin-bottom: 15px; padding: 10px;">Toggle Menu Reveal</button>
    <ul id="demoList" class="staggered-list">
        <li>Dashboard</li>
        <li>Profile</li>
        <li>Settings</li>
        <li>Logout</li>
    </ul>
</div>

View Output Full Screen Preview

Accessibility Considerations

While elegant, cascading sliding motions can be aggravating for users with vestibular issues. We can use the prefers-reduced-motion media query to swap the sliding animation for a simple, quick fade-in effect. prefers-reduced-motion is a CSS media feature used to detect if a user has enabled a setting on their operating system or browser to minimize the amount of non-essential animation or motion.

Here's what we used in our example:


@media (prefers-reduced-motion: reduce) {
    .staggered-list.show li {
        /* Swap out the slide for a gentle fade on the original spot */
        animation: simpleFade 0.3s ease forwards;
    }
    
    @keyframes simpleFade {
        to { opacity: 1; transform: translateX(-20px); }
    }
}