Home Web Front-end CSS Tutorial How to Mask Overflowing Content with Rounded Corners in Chrome and Opera?

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

Dec 30, 2024 am 11:18 AM

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);
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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;
}
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<div>
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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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