Use a semantic list of images in a horizontally scrollable track, add CSS Scroll Snap for reliable alignment, and layer JavaScript controls on top only when you need them. This approach works with touch, trackpads, mouse wheels, keyboards and assistive technology without making JavaScript responsible for basic scrolling. The complete example below includes previous/next buttons, slide announcements, optional autoplay, responsive sizing and reduced-motion handling.
What a sliding image gallery is
A sliding image gallery is a carousel: a set of related slides shown in sequence while the visitor moves forward or backward with a swipe, scroll gesture, buttons or picker controls. Image galleries are a common carousel use case in W3C WAI guidance.
The most resilient implementation has three layers:
- Semantic HTML: a labeled region containing a list of slides and real
<img>elements. - CSS: a horizontal overflow track with
scroll-snap-typeandscroll-snap-align. - JavaScript: optional controls that scroll to a slide, track the current slide and announce changes.
Native scrolling remains usable if JavaScript fails, while the controls add convenience for people who prefer explicit navigation.
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Complete implementation
1. Semantic HTML
Give the gallery a visible heading and use that heading to label the region. Each slide is a list item. Replace the sample image URLs and alternative text with content that describes the actual image and its purpose.
<section class="gallery" aria-labelledby="gallery-title">
<h2 id="gallery-title">Product details</h2>
<div class="gallery-viewport">
<ul class="gallery-track" id="gallery-track">
<li class="gallery-slide" id="slide-1">
<img src="images/front.jpg" alt="Front view of the blue travel backpack">
</li>
<li class="gallery-slide" id="slide-2">
<img src="images/inside.jpg" alt="Inside compartments of the blue travel backpack">
</li>
<li class="gallery-slide" id="slide-3">
<img src="images/straps.jpg" alt="Padded shoulder straps on the blue travel backpack">
</li>
</ul>
</div>
<div class="gallery-controls">
<button type="button" id="gallery-prev" aria-label="Previous image">Previous</button>
<span id="gallery-status" role="status" aria-live="polite">Image 1 of 3</span>
<button type="button" id="gallery-next" aria-label="Next image">Next</button>
</div>
</section>Do not put meaningful images in CSS backgrounds: screen readers cannot use their alternative text. If an image is purely decorative, use an empty alt="" instead of repeating nearby text.
2. CSS scrolling and snap points
The viewport hides horizontal overflow; the track remains a single row. scroll-snap-type: x mandatory asks the browser to settle on a slide after a gesture. Use proximity instead if you want users to stop between slides during free scrolling.
.gallery {
max-width: 70rem;
margin-inline: auto;
padding: 1rem;
}
.gallery-viewport {
overflow-x: auto;
overscroll-behavior-x: contain;
scroll-behavior: smooth;
scrollbar-width: thin;
}
.gallery-track {
display: grid;
grid-auto-flow: column;
grid-auto-columns: 100%;
gap: 1rem;
margin: 0;
padding: 0;
list-style: none;
scroll-snap-type: x mandatory;
}
.gallery-slide {
min-width: 0;
scroll-snap-align: start;
scroll-snap-stop: always;
}
.gallery-slide img {
display: block;
width: 100%;
height: auto;
aspect-ratio: 16 / 9;
object-fit: cover;
border-radius: .5rem;
}
.gallery-controls {
display: flex;
align-items: center;
justify-content: center;
gap: .75rem;
margin-top: .75rem;
}
.gallery-controls button {
min-width: 6rem;
min-height: 2.75rem;
}
@media (min-width: 48rem) {
.gallery-track { grid-auto-columns: 70%; }
}
@media (prefers-reduced-motion: reduce) {
.gallery-viewport { scroll-behavior: auto; }
}The mobile rule shows one slide at a time; the wider rule exposes part of the next slide as a visual cue. If every slide must be fully visible, keep grid-auto-columns: 100% at all widths. Test the chosen width with real content, not only empty placeholders.
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This script finds the nearest slide from the track’s scroll position, scrolls by index, disables buttons at the ends and updates a polite live region. It uses buttons rather than clickable non-semantic elements, so keyboard activation works by default.
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const track = document.querySelector('#gallery-track');
const slides = [...track.querySelectorAll('.gallery-slide')];
const previous = document.querySelector('#gallery-prev');
const next = document.querySelector('#gallery-next');
const status = document.querySelector('#gallery-status');
let current = 0;
function setCurrent(index, move = true) {
current = Math.max(0, Math.min(index, slides.length - 1));
if (move) {
slides[current].scrollIntoView({
behavior: window.matchMedia('(prefers-reduced-motion: reduce)').matches ? 'auto' : 'smooth',
block: 'nearest',
inline: 'start'
});
}
previous.disabled = current === 0;
next.disabled = current === slides.length - 1;
status.textContent = `Image ${current + 1} of ${slides.length}`;
}
previous.addEventListener('click', () => setCurrent(current - 1));
next.addEventListener('click', () => setCurrent(current + 1));
let scrollTimer;
track.addEventListener('scroll', () => {
clearTimeout(scrollTimer);
scrollTimer = setTimeout(() => {
const left = track.scrollLeft;
let nearest = 0;
let distance = Infinity;
slides.forEach((slide, index) => {
const difference = Math.abs(slide.offsetLeft - left);
if (difference < distance) {
distance = difference;
nearest = index;
}
});
if (nearest !== current) setCurrent(nearest, false);
}, 80);
});
setCurrent(0, false);The timeout prevents an announcement on every intermediate scroll event. For very large galleries, replace the offset loop with an IntersectionObserver so the browser reports which slide is mostly visible.
Adding picker dots or thumbnails
Picker controls are optional. If you add them, use buttons with visible labels or an accessible name such as “Show image 2 of 3.” Mark the selected control with aria-current="true" (or an equivalent selected state) and update it whenever the current slide changes. Keep the buttons in a logical tab order and do not create a second, conflicting way to announce the same state.
Thumbnail images need their own useful alternative text. If the thumbnail’s visible label already identifies the image, its alt can be empty to avoid duplicate announcements.
Autoplay: only when visitors can control it
Automatic rotation is often unnecessary and can make text hard to read. W3C WAI states: “Users must be able to pause carousel movement because it can be too fast or distracting, making text hard to read.” If rotation serves a clear purpose:
- Place a clearly labeled Pause/Play button before the rotating content.
- Stop rotation when keyboard focus enters the gallery.
- Stop rotation while the pointer hovers over it.
- After focus has entered, require an explicit user action to restart; do not silently resume.
- Respect
prefers-reduced-motion: reduceby starting paused. - Do not move focus automatically when a timer changes slides.
A minimal timer can call setCurrent((current + 1) % slides.length) every few seconds, but only after implementing the pause, focus, hover and reduced-motion rules above. Never hide off-screen slides from the accessibility tree in a way that leaves their text exposed without context; follow the WAI carousel pattern for slide visibility and labeling.
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Responsive images and loading performance
Choose an appropriate source
Use srcset and sizes so phones do not download desktop-sized files. Set a stable width and height (or an aspect-ratio) to prevent layout shifts. Compress photographs and prefer WebP or AVIF when your browser support policy allows them.
<img
src="images/front-960.webp"
srcset="images/front-480.webp 480w, images/front-960.webp 960w, images/front-1440.webp 1440w"
sizes="(min-width: 48rem) 70vw, 100vw"
width="1440"
height="810"
alt="Front view of the blue travel backpack">Load only what the page needs
Keep the first image eager because it is immediately visible. Add loading="lazy" to later slides when a gallery contains many or very large images. Do not lazy-load the image that is visible at first paint. Preload only a likely next image if testing shows a real benefit; excessive preloads compete with the main page.
Accessibility and keyboard checklist
- The region has a visible heading and an
aria-labelledbyrelationship. - Every informative image has accurate alternative text.
- Previous, next, picker and pause controls are native buttons.
- Controls have a visible focus indicator and sufficient hit area.
- Slide changes are communicated through a concise status message.
- Users can operate the gallery with Tab and Enter/Space as well as touch.
- There is no forced focus movement when a slide changes.
- Autoplay can be paused, stops on focus and hover, and honors reduced motion.
- At narrow widths, content is not clipped vertically or horizontally except inside the intended viewport.
Test with a keyboard, a screen reader, touch, a trackpad, zoom at 200 percent and a narrow viewport. Verify that focus never lands on content that is visually hidden but still announced. Also test with JavaScript disabled: the scrollable list should remain usable.
Choosing an implementation approach
| Approach | Best for | Trade-offs |
|---|---|---|
| Scrollable list plus CSS Scroll Snap | A simple gallery that needs native touch and scrolling | You must test snap behavior, responsive widths and target browsers. |
| Newer declarative CSS carousel features | Projects that want browser-provided controls or markers | Support is browser-specific. Chrome for Developers describes CSS Overflow 5 carousel features from Chrome 135; verify every target browser before relying on them. |
| JavaScript-enhanced controls | Previous/next buttons, pickers, announcements or custom state | You must keep state, keyboard behavior and announcements synchronized. |
Progressive enhancement is the safe default: build the semantic scrolling list first, then add newer CSS or JavaScript where supported.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common failures
The track does not slide
Inspect the track and confirm it has display: grid (or a flex row), that slides cannot shrink below their intended width, and that the viewport—not the whole page—has overflow-x: auto. Check that images have loaded and that no parent has overflow: hidden clipping the wrong element.
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Snapping feels jerky or lands between images
Make each slide’s width deterministic, give each slide scroll-snap-align, and avoid changing image dimensions after load. Use proximity instead of mandatory if users need to stop freely. Re-test after changing the desktop column width.
The Tool Desk
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Update state from both button actions and user scrolling. Debounce the scroll handler, calculate the nearest slide from its offset, and clamp the index at zero and the last slide. Recalculate after a resize if slide widths change.
Screen readers announce too much
Use one labeled region, concise image alternative text and one live status message. Do not place every hidden slide’s long caption in an always-live region. Follow the WAI pattern for how off-screen slides are exposed.
Autoplay causes complaints
Add a prominent pause control, stop on focus and hover, disable it for reduced-motion users, and require a user action to restart after focus. Removing autoplay entirely is often the better design.
Images are slow or layout shifts occur
Provide dimensions or an aspect ratio, serve responsive compressed files, lazy-load later slides, and inspect the network panel for unexpectedly large originals or duplicate downloads.
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Or skip the browser setup
If you need screenshots of a finished gallery rather than an interactive gallery inside your site, ScreenshotNeo can capture the page with one request. It accepts the cookie or consent banner like a visitor and removes more than 60 known consent platforms, newsletter popups and chat widgets before the shot. Bot checks, CAPTCHAs, blank pages, timeouts, failed loads and cache hits are not billed; response headers identify the page verdict and whether it was billed. Its MCP server provides take_screenshot, get_page_info and capture_pdf tools for Claude, Cursor and other MCP clients.
See the ScreenshotNeo documentation for all options, including full-page capture with lazy images loaded, CSS-selector element capture, device presets, custom CSS and JavaScript, waits, request blocking, cookies and headers, PDF output, caching, signed links, asynchronous jobs, bulk capture of up to 100 URLs per call and usage reporting.
cURL
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com/gallery -o gallery.webpPython
import requests
r = requests.get(
"https://api.screenshotneo.com/v1/shot",
params={"access_key": "YOUR_API_KEY", "url": "https://example.com/gallery"},
timeout=90,
)
r.raise_for_status()
open("gallery.webp", "wb").write(r.content)Node.js
const q = new URLSearchParams({
access_key: 'YOUR_API_KEY',
url: 'https://example.com/gallery'
});
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
const fs = await import('node:fs/promises');
await fs.writeFile('gallery.webp', Buffer.from(await res.arrayBuffer()));There is a free allowance of 1,000 screenshots each month with no card; paid plans start at $5 for 3,000. Create a free ScreenshotNeo account to try it.
Frequently Asked Questions
Should every gallery use a carousel library?
No. A semantic list, CSS overflow and Scroll Snap cover the basic interaction. Add a library only when its extra state management or effects solve a requirement you cannot maintain clearly yourself.
How many images should one gallery contain?
There is no universal limit. Keep the set focused, optimize the files, and consider separate galleries or a lightbox when a long sequence becomes difficult to scan.
Can I use vertical slides?
Yes. Change the track to a vertical layout and use scroll-snap-type: y with scroll-snap-align; repeat the same labeling, keyboard and motion rules.
Quick Recap
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