How Can I Create Inverted Rounded Corners in CSS Using Modern Techniques and Maintain Cross-Browser Compatibility?

Innovative Techniques for Inverted Rounded Corners in CSS

Achieving the desired visual effect of inverted rounded corners can be a challenge, especially in cross-browser scenarios. However, CSS advancements offer innovative solutions to defy these limitations.

Modern CSS Solution for Inverted Rounded Corners

In modern browsers, the mask-image property emerges as the key to creating this inverted effect. This property allows you to define an image to be used as a masking layer over the element, effectively "cutting out" the desired shape.

Consider the following example:

#aux-container {
  width: 100px;
  height: 100px;
  background: #f00;
  -webkit-mask-image: radial-gradient(circle 10px at 0 0, transparent 0, transparent 20px, black 21px);
}

In this snippet, we define an element #aux-container with a solid red background. We then apply a radial gradient mask image that defines a circular cutout with a radius of 10px. This creates the illusion of an inverted rounded corner, effectively "cutting out" the corner from the red background.

Compatibility Considerations

While mask-image is supported by modern browsers such as Chrome, Firefox, and Safari, it is crucial to note its limited support in Internet Explorer. For wider browser compatibility, consider using third-party libraries such as CSS Masks, which provide cross-browser support.

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