How to Mask Overflowing Content with Rounded Corners in Chrome and Opera?

Hiding Overflow with Rounded Corners in Chrome and Opera

Question:

How can you create a parent div with rounded corners that successfully masks the content of its children while maintaining proper overflow behavior in Chrome and Opera?

Webkit Incompatibility with Overflow: Hidden

In browsers such as Firefox and IE9, applying "overflow: hidden" to a parent div with rounded corners effectively hides any overflowing content. However, in webkit-based browsers (Chrome, Safari) and Opera, this approach fails when the parent div is positioned relatively or absolutely.

Solution: WebKit Mask

An alternative solution involves using a webkit mask on the parent div. This approach masks the area outside the rounded corners, effectively concealing any overflowing content.

Implementation:

To implement this solution, add the following CSS to the parent div:

-webkit-mask-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAA5JREFUeNpiYGBgAAgwAAAEAAGbA+oJAAAAAElFTkSuQmCC);

This CSS property references a single-pixel transparent PNG image, which can be included directly in the CSS to avoid an additional HTTP request.

Example:

Consider the following code:

#wrapper {
  width: 300px;
  height: 300px;
  border-radius: 100px;
  overflow: hidden;
  position: absolute; /* original CSS that broke overflow in webkit browsers */
  -webkit-mask-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAA5JREFUeNpiYGBgAAgwAAAEAAGbA+oJAAAAAElFTkSuQmCC); /* webkit mask fix */
}

#box {
  width: 300px;
  height: 300px;
  background-color: #cde;
}

<div>

By incorporating this fix, the rounded corners will now effectively hide any overflowing content in Chrome and Opera, allowing for a visually clean and responsive design.

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