1/21/2024 0 Comments Css clip box shadowWe also have another property called background-origin that specifies which of the three boxes the background-position (and background-size, if expressed in %) is relative to. See the Pen backgrounds – helper demo #2 by CSS-Tricks ( on CodePen. These three situations are illustrated by the following live demo: background-clip: padding-boxĪnd finally, if we have background-clip: content-box, the clipping region is the content-box, so the background is only displayed within the content-box limit. If we set background-clip: padding-box, the clipping region is the padding-box, meaning that the background is only displayed within the padding-box limit (it doesn’t go underneath the border). In the default case of background-clip: border-box, the clipping region is the border-box, so we have the background underneath the border as well. Clipping means cutting out and not displaying what falls outside the clipping region, where the clipping region is the area inside the dotted line in the illustration below. We can make the background cover just the padding-box or just the content-box with the help of background-clip. Using just one value for setting the background-size doesn’t produce consistent results across browsers ( live test) left: Firefox (per spec, takes the second value to be 100%) right: Chrome/ Opera, Safari, IE/ Edge (incorrectly take the second value to be equal to the first) So unless we want both dimensions of our background-size to be 100%, we should use two values. A missing background-size value is taken to be auto and since gradients have no intrinsic dimensions or intrinsic proportions, the auto value cannot be resolved from those, so it should get treated as 100%. If we use just one value, Firefox takes the second one to be 100% ( per spec), while every other browser incorrectly takes the second value to be equal to the first. When setting the background-size for a gradient (but not for actual images), we usually need two values for consistent results across browsers. by default, backgrounds cover the entire border-box, but start from the top left corner of the padding-box We can also see that the background-size set in % is relative to the padding-box. We can see this is relative to the padding-box because it starts from the top left corner (the 0 0) of this box. We haven’t specified a background-position, so it takes the default value - 0 0. In this demo, we can see that the gradient background covers the entire border-box (it’s visible underneath the hashed border). See the Pen default background-origin and background-clip (basic version) by CSS-Tricks ( on CodePen. We take a box with random dimensions, give it a simple gradient background of background-size: 50% 50% and a hashed border ( using border-image) so we can still see through the hashes what’s underneath the border: In order to better understand this, let’s consider an example. with padding: 0 and border-width: 0īy default, backgrounds cover the entire border-box (they are applied underneath the border as well), but their background-position (and also %-based background-size) is relative to the padding-box. If both the padding and the border-width are 0, then all the three boxes (the content-box, the padding-box, and the border-box) have the same size, and the content limit, the padding limit, and the border limit all coincide. If the border-width is 0, the border-box is the same size as the padding-box, and the border limit coincides with the padding limit. If the padding is 0, then the padding-box is exactly the same size as the content-box, and the content limit coincides with the padding limit. In the following image, we have an element’s box model. I also learned a lot from doing that and this article shares some of those lessons.īefore anything else, let’s see what background-clip is and what it does. All this meant I ended up using backgrounds, borders, and shadows a lot. Even though that does work in certain browsers, the fact that it works is actually a bug and I didn’t want to rely on that. Some of the designs I chose to reproduce were a bit more complex and I only had one element available per slider, which happened to be an input element, meaning that I couldn’t even use pseudo-elements on it. Until last year, when I started creating my huge collection of sliders. Maybe just a couple of times as part of a solution to a Stack Overflow question. Background-clip is one of those properties I’ve known about for years, but rarely used.
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