.mega-header::before { content: “”; position: absolute; top: 0; right: 0; width: 75%; height: 90%; background-image: radial-gradient(ellipse closest-side, rgba(15, 14, 22, 0.5), #100e17), url(https://res.cloudinary.com/css-tricks/image/fetch/w_1200,q_auto,f_auto/https://css-tricks.com/wp-content/uploads/2018/11/Untitled_Artwork.jpg); background-size: cover; background-repeat: no-repeat; opacity: 0.75; }

I can’t say I use background-clip all that often. I’d wager it’s hardly ever used in day-to-day CSS work. But I was reminded of it in a post by Stefan Judis, which consistently was itself a learning-response post to a post over here by Ana Tudor.

Here’s a quick explanation.

You’ve probably seen this thing a million times:

The box model visualizer in DevTools.

That’s showing you the size and position of an element, as well as how that size is made up: content size, padding, margin, and border.

Those things aren’t just theoretical to help with understanding and debugging. Elements actually have a content-box, padding-box, and border-box. Perhaps we encounter that most often when we literally set the box-sizing property. (It’s tremendously useful to universally set it to border-box).

Those values are the same values as background-clip uses! Meaning that you can set a background to only cover those specific areas. And because multiple backgrounds is a thing, that means we can have multiple backgrounds with different clipping on each.

Like this:

See the Pen
Multiple background-clip
by Chris Coyier (@chriscoyier)
on CodePen.

But that’s boring and there are many ways to pull off that effect, like using borders, outline, and box-shadow or any combination of them.

What is more interesting is the fact that those backgrounds could be gradients, and that’s a lot harder to pull off any other way!

See the Pen
Nested Gradients
by Chris Coyier (@chriscoyier)
on CodePen.

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