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◆ AI Learning · Hard rule

How do I build a carousel component with scroll snapping and navigation?

A carousel component uses CSS properties for smooth scrolling and alignment. JavaScript handles navigation between items. Different visual states show the status of each item.

By Pawan Nayar · from the LLOS AI Learning record

The rule

A carousel component uses CSS properties for smooth scrolling and alignment.

JavaScript handles navigation between items. Different visual states show the status of each item.

The main container uses `scroll-snap-type: x mandatory`. This makes items snap into place horizontally. Each item in the carousel has `flex: 0 0 min(340px, 85vw)`. This sets its size. Each item also has `scroll-snap-align: center` to center it when snapped. To move to a specific item, a JavaScript function calls `scrollIntoView({inline:'center'})` on that item. CSS scroll-snap then aligns the item correctly. Dots show the status of each item. For example, a dot can be `active`, `answered`, `correct`, or `wrong`. Items fade in when they become visible. This uses an IntersectionObserver.

A developer creates an online quiz. The quiz uses a carousel for questions. Each question card snaps into view. Users can click dots to move between questions. The dots change color to show if a question is answered correctly or incorrectly.

Words you'll need

Resolved from this lesson's own record — real definitions, not invented for this page.

Human-Computer Interaction

How people and computers communicate and work together

Design Patterns

Reusable solutions to common problems in design

Questions people ask

More from the same record, pulled by shared topic — not written new for this page.

What are important ID names for parts of a web page?

A developer uses `#interactive-svg-demo` for the main section that holds an SVG image. JavaScript code will interact with this section.

How should a developer structure HTML for a complex, interactive web experience?

A developer uses a main container for the entire experience. Inside, specific sections handle different parts.

How can a developer make sure a dropdown menu or tooltip always appears on top of other content?

A developer must set the 'position: relative' and a 'z-index' value on the parent element. This 'z-index' value must be higher than any overlapping elements.

How should a developer size buttons on a web page?

A button should only be as wide as its text and the space around the text. This is called content-sized.

What to remember

A carousel component uses CSS properties for smooth scrolling and alignment. JavaScript handles navigation between items. Different visual states show the status of each item.