Inset Border-Radius with CSS3
In CSS3, achieving inset border-radius, where the corners are curved inward rather than outward, can be challenging without using images. However, there's a clever solution that utilizes CSS3 gradients.
Lea Verou's ingenious approach involves creating a series of transparent gradients with curves, creating the illusion of inset border-radius. By positioning these gradients precisely, you can achieve the desired rounded corners effect.
Her CSS code, as seen below, defines a custom class for an element with the desired inset border-radius:
div.round { background: -moz-radial-gradient(0 100%, circle, rgba(204,0,0,0) 14px, #c00 15px), -moz-radial-gradient(100% 100%, circle, rgba(204,0,0,0) 14px, #c00 15px), -moz-radial-gradient(100% 0, circle, rgba(204,0,0,0) 14px, #c00 15px), -moz-radial-gradient(0 0, circle, rgba(204,0,0,0) 14px, #c00 15px); background: -o-radial-gradient(0 100%, circle, rgba(204,0,0,0) 14px, #c00 15px), -o-radial-gradient(100% 100%, circle, rgba(204,0,0,0) 14px, #c00 15px), -o-radial-gradient(100% 0, circle, rgba(204,0,0,0) 14px, #c00 15px), -o-radial-gradient(0 0, circle, rgba(204,0,0,0) 14px, #c00 15px); background: -webkit-radial-gradient(0 100%, circle, rgba(204,0,0,0) 14px, #c00 15px), -webkit-radial-gradient(100% 100%, circle, rgba(204,0,0,0) 14px, #c00 15px), -webkit-radial-gradient(100% 0, circle, rgba(204,0,0,0) 14px, #c00 15px), -webkit-radial-gradient(0 0, circle, rgba(204,0,0,0) 14px, #c00 15px); background-position: bottom left, bottom right, top right, top left; -moz-background-size: 50% 50%; -webkit-background-size: 50% 50%; background-size: 50% 50%; background-repeat: no-repeat; }
Applying this class to an element will result in an element with inset border-radius. It's important to note that this technique relies on support for rgba and gradients, making it a progressive enhancement strategy. For older browsers or browsers that don't support gradients, an image-based fallback is recommended for providing support.
The above is the detailed content of How Can I Create Inset Border-Radius Using Only CSS3?. For more information, please follow other related articles on the PHP Chinese website!

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