Module 26 : CSS Scroll Snap – Creating Smooth Scrolling Sections
Introduction to CSS Scroll Snap
CSS Scroll Snap is a powerful feature that allows developers to create smooth, controlled scrolling experiences on web pages. It is particularly useful for sections of a website that require a snap-to-point scrolling behavior, such as:
Image carousels
Full-page scrolling sections
Product showcases
Timeline-based content
Benefits of Using Scroll Snap
Provides a seamless user experience
Reduces effort for users when navigating long pages
Works well with both horizontal and vertical scrolling
Enhances touch interactions on mobile devices
Key Properties of CSS Scroll Snap
CSS Scroll Snap consists of three key properties:
scroll-snap-type
scroll-snap-align
scroll-snap-stop
1. scroll-snap-type
Defines how snap behavior works on a container.
.scroll-container {
scroll-snap-type: y mandatory; /* Vertical scrolling with mandatory snapping */
overflow-y: scroll;
height: 100vh;
}
x or y: Defines the axis of scrolling (horizontal or vertical)
mandatory: Forces snap points to always apply
proximity: Snaps only when scrolling stops close to a snap point
2. scroll-snap-align
Defines how individual elements align within the snapping container.
.section {
scroll-snap-align: start; /* Ensures sections snap to the start */
height: 100vh;
}
start: Aligns the start of the element
center: Aligns the center of the element
end: Aligns the end of the element
3. scroll-snap-stop
Controls whether snapping is strict or can be skipped.
.section {
scroll-snap-stop: always; /* Ensures every section is fully scrolled into view */
}
normal: Default behavior
always: Prevents users from skipping snap points while scrolling fast
Practical Example: Full-Screen Sections
HTML
<div class="scroll-container">
<section class="section section1">Section 1</section>
<section class="section section2">Section 2</section>
<section class="section section3">Section 3</section>
</div>
CSS
.scroll-container {
scroll-snap-type: y mandatory;
overflow-y: scroll;
height: 100vh;
}
.section {
scroll-snap-align: start;
height: 100vh;
display: flex;
align-items: center;
justify-content: center;
font-size: 2rem;
color: white;
}
.section1 { background: #ff5733; }
.section2 { background: #33ff57; }
.section3 { background: #3357ff; }
Advanced Features
Adding Smooth Scrolling
To enhance the smoothness of scroll snap, add:
html {
scroll-behavior: smooth;
}
Horizontal Scroll Snapping
For horizontal scrolling sections:
.scroll-container {
scroll-snap-type: x mandatory;
display: flex;
overflow-x: scroll;
width: 100vw;
}
.section {
scroll-snap-align: center;
min-width: 100vw;
}
Exercises and Practice
Exercise 1: Create a Scrollable Gallery
Implement a horizontally scrolling gallery where images snap into place.
Ensure smooth scrolling behavior.
Exercise 2: Build a Vertical News Section
Develop a vertically scrolling news section with snap points at the start of each news item.
Exercise 3: Implement a Product Slider
Create a product showcase with snapping cards that slide horizontally.
Lecture Notes
Key Topics to Cover
Introduction to Scroll Snap – Explain what CSS Scroll Snap is and why it’s useful.
Understanding the Properties – Go through scroll-snap-type, scroll-snap-align, and scroll-snap-stop with examples.
Building Practical Examples – Demonstrate full-page scrolling and image sliders.
Best Practices & Performance Considerations – Ensure smooth animations and minimal performance impact.
Live Coding Session – Implement a complete project in real-time.
Summary
CSS Scroll Snap is a fantastic tool for creating intuitive scrolling experiences. By mastering its properties and experimenting with different snapping behaviors, you can build highly engaging interfaces for modern web applications.
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