CSS Scroll Snap creates a smooth scrolling experience for scenes such as horizontal swipe, paging scrolling, etc. 1. Set the container to use overflow and scroll-snap-type, and add scroll-snap-align to the child to achieve alignment; 2. The scrolling direction can be selected as x or y axis, and the adsorption behavior is controlled through mandatory or proximity; 3. Common problems include unclear container size, child not full of viewport, or abnormal stacking context, and fixed size and min-width/height should be set; 4. Combined with scroll-behavior to achieve smooth scrolling, and combined with overscroll-behavior to control boundary rebound to improve user experience.

CSS Scroll Snap is a powerful tool to create a smooth, controllable scrolling experience. It is especially suitable for horizontal sliding content display, paging scrolling, or scenes where users need to be guided to browse at a fixed rhythm.

Here are some practical tips and structural suggestions to help you achieve a more natural and engaging scrolling experience with CSS Scroll Snap.

1. Basic structure: Set containers and sub-items

To use Scroll Snap, you must first have a scroll container (usually overflow: scroll or overflow-x: auto ) and then set scroll-snap-type property on that container.

 .container {
  overflow-x: auto;
  display: flex;
  scroll-snap-type: x mandatory;
}

Each child that can be "adsorbed" needs to be added:

 .item {
  scroll-snap-align: start;
  min-width: 100%;
}

This way, each time you scroll, the page will automatically align to the nearest child starting point.

Note: If you do not use flex or grid , make sure the child width is consistent and the container is filled, otherwise it may not be properly adsorbed.

2. Rolling direction control: horizontal or vertical?

Scroll Snap supports two main scrolling directions:

• Horizontal scrolling : suitable for card display, picture gallery, etc.
• Vertical scrolling : commonly used for full-screen page switching or step-by-step navigation

Set the spindle direction by scroll-snap-type :

 /* Horizontal scroll*/
scroll-snap-type: x mandatory;

/* Vertical scroll*/
scroll-snap-type: y mandatory;

If you want to trigger adsorption behavior only on certain elements, you can use proximity instead of mandatory so that the browser can decide whether to "jump" over.

3. Avoid FAQs: Insensitive rolling or failed adsorption

Sometimes Scroll Snap is set but it doesn't respond, usually because of the following reasons:

• The container has no clear size or scrolling is not enabled
• The child has not set scroll-snap-align
• Use transform , filter and other properties to cause cascaded context exceptions

Solutions include:

• Make sure the container has a fixed width/height
• Children use min-width: 100% or min-height: 100% to support the viewport
• If you use transform , try adding will-change: scroll-position or adjusting z-index

4. Improve user experience: Combining animation and touch optimization

Scroll Snap itself only defines the position where the scroll stops and cannot directly add transition effects. To make the scrolling process smoother, you can combine scroll-behavior :

 .container {
  scroll-behavior: smooth;
}

However, it should be noted that scroll-behavior has limited support on mobile, especially Safari may not work. At this time, it can be compensated by controlling the scrolling behavior through JavaScript.

In addition, if you want the user to "bounce back" after sliding, you can consider matching overscroll-behavior :

 .container {
  overscroll-behavior: contains;
}

This is useful in carousel graphs or boot pages to prevent users from slipping out of boundaries.

Basically that's it. Although simple, CSS Scroll Snap has many details, especially in terms of cross-device compatibility, it requires more testing. By mastering the basic structure and handling of common problems, you can create a good interactive experience.

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