> 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-window-frontend ## Namespace: rendering ## Article: Introduction ## Article Link: https://dev.wix.com/docs/velo/apis/wix-window-frontend/rendering/introduction.md ## Article Content: # Introduction When possible, the rendering process that runs when a page loads is split in 2 in order to improve performance. The first cycle in the process happens server-side and the second cycle happens client-side. When not possible, all rendering happens client-side. Use the Rendering API to track when and where your code is running to selectively run parts of your code in certain conditions. To use the Rendering API, import `wixWindowFrontend` from the `wix-window-frontend` module: ```javascript import wixWindowFrontend from 'wix-window-frontend'; ```