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CSS

Practical Scroll Snapping Caveats

A horizontal scroll snap rail that demonstrates mandatory versus proximity snapping, scroll-padding, focus framing, and tall-card caveats.

Duration
2s
Resolution
1440×900
Format
CSS
scroll-snapscroll-paddingmandatoryproximityfocus

Scroll Snap / Caveat Handling

Practical Scroll Snapping Caveats

A horizontal snap rail shows mandatory/proximity tradeoffs, scroll-padding, and a tall-card caveat without hiding focused content.

carousel rail scroll snap - 1.6s cycle · 1.00 intensity
Rail 1Rail 2Rail 3

Mandatory snap

Carousel Rail

A compact rail uses mandatory snap because every card fits within the viewport.

Items use snap-align and the scroller declares the snap axis explicitly.

  • scroll-snap
  • scroll-padding
  • carousel
Story 1Story 2Story 3

Proximity fallback

Story Rail

A taller slide switches to proximity so middle content remains reachable.

The scroller relaxes snap strictness when item height can exceed the viewport.

  • proximity
  • tall-slide
  • caveat
Inset 1Inset 2Inset 3

Centered framing

Inset Snap

Scroll padding gives first and last items the same intentional framing.

The first and last stops honor the same inset as the middle items.

  • center snap
  • scroll-padding
  • focus

Scroll snap inspector

Carousel Rail

Rail 1Rail 2Rail 3
Motion contract
Items use snap-align and the scroller declares the snap axis explicitly.
Accessibility
Focusable cards keep enough scroll-padding to avoid being hidden under edges.

Mandatory snap is safe when every snap item can be consumed at its snapped position.

css
.snap-rail {
  display: grid;
  grid-auto-flow: column;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: 24px;
}

.snap-card {
  scroll-snap-align: center;
}

.snap-rail[data-tall="true"] {
  scroll-snap-type: x proximity;
}