1. View Transitions API (single-document)

    Provides a mechanism for easily creating animated transitions between different DOM states, while also updating the DOM contents in a single step. This API is specific to single-document transitions, support for same-origin cross-document transitions is [being planned](https://github.com/WICG/view-transitions/blob/main/cross-doc-explainer.md).

  2. document api: startviewtransition

  3. viewtransition api

  4. viewtransition api: finished

  5. viewtransition api: ready

  6. viewtransition api: skiptransition

  7. viewtransition api: updatecallbackdone