# buildPartialBlock(accumulated:next:) ``` static func buildPartialBlock(accumulated: some KeyframeTrackContent, next: some KeyframeTrackContent) -> some KeyframeTrackContent ``` --- 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)