# transition Applies transition effects that either stand by itself (no neighboring elements), combine two neighboring elements, or apply to a single element. ## Discussion Transition effect applies to elements contained in a `spine` or `mc-angle`. Use the `offset` and `duration` attributes to define the position and extent of the transition effect. The [filter-video](/documentation/Professional-Video-Applications/filter-video) and [filter-audio](/documentation/Professional-Video-Applications/filter-audio) elements specify the effect to apply.  > Note: > When an audio filter specifies an audio cross fade, the cross fade doesn’t take effect on either side when the clip has audio-specific timing set by the `audioStart` or `audioDuration` attributes. This is known as a J- or L-cut, depending on the side of the transition on which it it occurs. --- 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)