> Portal Navigation: > > - Append `.md` to any URL under `https://dev.wix.com/docs/` to get its markdown version. > - Pages are either content pages (article or reference text) or menu pages (a list of links to child pages). > - To get a menu page, truncate any URL to a parent path and append `.md` (e.g. `https://dev.wix.com/docs/sdk.md`, `https://dev.wix.com/docs/sdk/core-modules.md`). > - Top-level index of all portals: https://dev.wix.com/docs/llms.txt > - Full concatenated docs: https://dev.wix.com/docs/llms-full.txt ## Resource: wix-animations-frontend ## Namespace: time-line ## Article: Introduction ## Article Link: https://dev.wix.com/docs/velo/velo-only-apis/wix-animations-frontend/time-line/introduction.md ## Article Content: # Introduction A timeline is used to compose animations together over time. You can synchronize multiple animations on matched elements, control them as a whole, and precisely manage their timing.