It takes as much energy to wish as it does to plan. — Eleanor Roosevelt
You scroll down to a certain point, now you want to style things in a certain way. A header becomes fixed. An animation triggers. A table of contents appears. To do anything based on scroll position, JavaScript is required right now. You watch the scroll position via a DOM event and alter an element's styling based on that position. Or, probably better if you can, use IntersectionObserver. We just blogged about all this.
Now there is a new (unofficial) … Read article
Let's say you wanted to scroll a web page from top to bottom programmatically. For example, you're recording a screencast and want a nice full-page scroll. You probably can't scroll it yourself because it'll be all uneven and jerky. Native JavaScript can do smooth scrolling. Here's a tiny snippet that might do the trick for you:
window.scrollTo({
top: document.body.getBoundingClientRect().height,
behavior: 'smooth'
});But there is no way to control the speed or easing of that! It's likely to … Read article
Smooth scrolling has gotten a lot easier. If you want it all the time on your page, and you are happy letting the browser deal with the duration for you, it's a single line of CSS:
html {
scroll-behavior: smooth;
}I tried this on version 17 of this site, and it was the second most-hated thing, aside from the beefy scrollbar. I haven't changed the scrollbar. I like it. I'm a big user of scrollbars and making it … Read article
Rik Schennink documents a system for being able to write CSS selectors that style a page when it has scrolled to a certain point. If you're like me, you're already on the lookout for document.addEventListener('scroll' ... and being terrified about performance. Rik gets to that right away by both debouncing the function as well as marking the event as passive.… Read article
Any overflow value other than visible and no height is the enemy of child elements with position: sticky;. It's like that element is ready to stick when the parent scrolls, but it never does because the height is unconstrained. Adding a fixed height can solve the issue, but that's not always desirable.
Dannie Vinther digs into a way of dealing with that. The end result is avoiding that situation all together by removing the element that wants to be … Read article
CSS scroll snapping allows you to lock the viewport to certain elements or locations after a user has finished scrolling. It’s great for building interactions like this one:… Read article
position: relative creates a new context for absolute positioning within an element? Well, position: sticky is a locally scoped version of position: fixed. Let's take a look at how that works using a modal with a sticky close button as an example. 
Smooth scrolling (the animated change of position within the viewport from the originating link to the destination anchor) can be a nice interaction detail added to a site, giving a polished feel to the experience. If you don't believe me, look at how many people have responded to the Smooth Scrolling snippet here on CSS-Tricks.… Read article
Scrolling is complicated. Nolan Lawson:
… Read article
- User scrolls with two fingers on a touch pad
- User scrolls with one finger on a touch screen
- User scrolls with a mouse wheel on a physical mouse
- User clicks the sidebar and drags it up and down
- User presses up, down, PageUp, PageDown, or spacebar keys on a keyboard
As it turns out, all five of these input methods have vastly different characteristics, especially when it comes to performance and cross-browser behavior. Some of
The web is a rather vertical place. You read a web site like you read a physical page: left to right, top to bottom. But sometimes, you want to step away from the verticality of it all and do something crazy: make a horizontal list. Or even crazier, a horizontal site!… Read article