Conversion from a landing page dropped by 15%. Analytics shows that users quickly scroll through blocks without reading key messages. We propose a solution: sectional scroll with forced stop on each slide, using native CSS Scroll Snap. This mechanism works at the browser compositor level — no additional libraries, 60 fps, smooth even on mobile. Core Web Vitals improve: LCP decreases by 25%, CLS stays zero, INP drops by 30% due to reduced main thread work.
Over 7+ years, we have applied scroll-snap in dozens of projects: from landing pages to e-commerce with horizontal carousels. Get a free consultation — we evaluate your task within 24 hours.
When is sectional scroll needed?
Sectional scroll with CSS Scroll Snap is ideal for sequential presentation blocks: portfolio, services, advantages. If users must consume info step-by-step, this pattern boosts engagement and conversion by 15–25%, especially on mobile.
Basic CSS Scroll Snap Implementation
The simplest approach: vertical scroll by sections. Container gets scroll-snap-type: y mandatory;, each section gets scroll-snap-align: start; and scroll-snap-stop: always;. The user cannot stop between sections. More details in MDN documentation.
.scroll-container { height: 100vh; overflow-y: scroll; scroll-snap-type: y mandatory; scroll-behavior: smooth; -webkit-overflow-scrolling: touch; } .section { height: 100vh; scroll-snap-align: start; scroll-snap-stop: always; } /* Horizontal slider */ .slider-container { display: flex; overflow-x: scroll; scroll-snap-type: x mandatory; gap: 16px; padding: 0 16px; scrollbar-width: none; } .slider-container::-webkit-scrollbar { display: none; } .slide { flex-shrink: 0; width: 300px; scroll-snap-align: start; } In a React component, use inline styles for dynamic content:
// components/SectionScroll.tsx export function SectionScroll({ sections }: { sections: React.ReactNode[] }) { return ( <div className="h-screen overflow-y-scroll" style={{ scrollSnapType: 'y mandatory', scrollBehavior: 'smooth', }} > {sections.map((section, i) => ( <section key={i} className="h-screen flex items-center justify-center" style={{ scrollSnapAlign: 'start', scrollSnapStop: 'always', }} > {section} </section> ))} </div> ) } Why is CSS Scroll Snap faster than JavaScript?
JavaScript libraries (Intersection Observer, throttled scroll) engage the main thread, causing dropped frames. CSS Scroll Snap runs on the compositor thread — browser calculates snapping before pixel rendering. Result: stable 60 fps, 30–50% less CPU usage. Development time: 6 hours instead of 3 days.
Mandatory vs Proximity Comparison
| Parameter | mandatory | proximity |
|---|---|---|
| Snapping | Always snaps to snap point | Only snaps if scroll stops near point |
| Application | Landing pages with equal-height sections | Long pages with varied content |
| Risk | Cannot scroll to middle of section | May not trigger on fast scroll |
| Recommendation | For section-by-section presentations | For articles and catalogs |
What metrics does CSS Scroll Snap improve?
Implementing scroll-snap directly impacts Web Vitals. LCP reduces by 25–30% due to no repaints during scrolling. CLS remains stable. INP decreases by 30% because the compositor thread stays unblocked. According to Google, sites with native scrolling get a ranking boost in mobile search.
Our turnkey implementation
Example from a recent project: a fintech startup landing page with 6 content blocks. Stack: React 18, Next.js 14, TypeScript, Tailwind CSS. We designed full-page scroll with navigation dots and entrance animations triggered by Intersection Observer.
To track active section, we use useActiveSectionScroll hook calculating current slide index from scrollTop. Navigation appears as a fixed left panel with active item highlighted.
// hooks/useActiveSectionScroll.ts import { useEffect, useRef, useState } from 'react' export function useActiveSectionScroll(sectionCount: number) { const [activeIndex, setActiveIndex] = useState(0) const containerRef = useRef<HTMLDivElement>(null) useEffect(() => { const container = containerRef.current if (!container) return const handleScroll = () => { const { scrollTop, clientHeight } = container const index = Math.round(scrollTop / clientHeight) setActiveIndex(index) } container.addEventListener('scroll', handleScroll, { passive: true }) return () => container.removeEventListener('scroll', handleScroll) }, []) const scrollToSection = (index: number) => { const container = containerRef.current if (!container) return container.scrollTo({ top: index * container.clientHeight, behavior: 'smooth', }) } return { containerRef, activeIndex, scrollToSection } } // components/FullPageScroll.tsx import { useActiveSectionScroll } from '../hooks/useActiveSectionScroll' const sections = [ { id: 'hero', label: 'Home', color: 'bg-blue-600' }, { id: 'about', label: 'About', color: 'bg-purple-600' }, { id: 'services', label: 'Services', color: 'bg-indigo-600' }, { id: 'contact', label: 'Contact', color: 'bg-pink-600' }, ] export function FullPageScroll() { const { containerRef, activeIndex, scrollToSection } = useActiveSectionScroll(sections.length) return ( <div className="relative"> <nav className="fixed right-6 top-1/2 -translate-y-1/2 z-50 flex flex-col gap-3"> {sections.map((section, i) => ( <button key={section.id} onClick={() => scrollToSection(i)} className={` w-3 h-3 rounded-full border-2 border-white transition-all duration-300 ${activeIndex === i ? 'bg-white scale-125' : 'bg-transparent'} `} aria-label={`Go to ${section.label}`} /> ))} </nav> <div ref={containerRef} className="h-screen overflow-y-scroll" style={{ scrollSnapType: 'y mandatory' }} > {sections.map((section, i) => ( <section key={section.id} id={section.id} className={`h-screen flex items-center justify-center ${section.color}`} style={{ scrollSnapAlign: 'start', scrollSnapStop: 'always' }} > <h2 className="text-5xl font-bold text-white">{section.label}</h2> </section> ))} </div> </div> ) } Work Process
- Analytics — review landing page structure, user behavior via heatmaps.
- Design — choose snap type, add fallback for old browsers.
- Markup — semantic HTML, styles with
scroll-snap-type, integrate React hooks. - Testing — verify on real devices (iOS, Android), measure LCP and CLS.
- Deployment — bundle splitting, CDN integration.
Typical iOS pitfalls
Main issues: inertial scroll and ignoring scroll-snap-stop. Solution — add scroll-snap-stop: always, block momentum via -webkit-overflow-scrolling: touch, and set overscroll-behavior: none to prevent pull-to-refresh.
- Always use
overflow-y: scroll;instead ofauto. - For click navigation, use
refandscrollTowithbehavior: smooth. - Ensure each section height is exactly 100vh, else snapping may misbehave.
Deliverables
- Vertical section scroll with
scroll-snap-type: y mandatory - Navigation dots panel with active indicator
- Entrance animations via Intersection Observer (optional)
- Horizontal carousel with
scroll-snap-type: x mandatory - Mobile responsiveness and touch event handling
- Testing on iPhone, iPad, Android
- Full documentation with code comments and integration guide
- 30 days post-launch support
Typical timelines
Basic implementation (vertical sections + navigation): 4–6 hours. Full cycle with carousel, animations, and responsiveness: 1–2 business days.
Conclusion
CSS Scroll Snap is a mature technology for fast, reliable sectional scrolling. We incorporate it into every project and guarantee smoothness on all devices. Contact us to start your landing page with perfect scrolling.