Let's say we have a <main> element containing significant content that causes it to scroll:
<main>
<!-- Significant content -->
</main>
The <main> element can be turned into a scroll container using a combination of CSS properties, for example:
main {
width: 250px;
height: 450px;
overflow: scroll;
}
We can then implement scroll snapping behavior on the scrolling content by specifying the scroll-snap-type property on the <html> element:
html {
scroll-snap-type: block mandatory;
}
The following JavaScript snippet would cause the scrollsnapchange event to fire on the HTML document when a child of the <main> element becomes a newly-selected snap target. In the handler function, we set a selected class on the child referenced by the SnapEvent.snapTargetBlock, which could be used to style it to look like it has been selected (for example, with an animation) when the event fires.
window.addEventListener("scrollsnapchange", (event) => {
event.snapTargetBlock.classList.add("selected");
});
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