# mask(content:) Masks chart content using the alpha channel of the specified content. ``` nonisolated func mask(@ContentBuilder content: () -> C) -> some ChartContent where C : ChartContent ``` ## Discussion Parameter content: The content whose alpha will be applied to this item. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)