Implementing an Image Carousel Without JavaScript Using the CSS Scroll-Snap API

Based on the principles of the Scroll-Snap API internally used by Swiper.js's cssMode, this article covers the process of implementing scroll correction effects using pure CSS without JavaScript.

Problem Scenario When using touch swipes or mouse wheel scrolling, the final scroll position may not align precisely with the image area, potentially degrading the user experience. The Scroll-Snap API provides a controlled scrolling environment that ensures the container aligns exactly with specific child elements.

Implementation Method

1. Setting up the scroll container: Use the scroll-snap-type property to specify the snap axis (x, y) and strictness (mandatory, proximity). mandatory forces a snap to occur, while proximity snaps only when close to a snap point.
2. Aligning child elements: Use the scroll-snap-align property to determine the snap alignment method (start, center, end). start aligns the left side of the container with the left side of the element.

Applications This approach allows for controlled scrolling experiences in various UI components, including image carousels, page scrolling, and dropdowns.