> 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: $w ## Namespace: selection-tags ## Article: Introduction ## Article Link: https://dev.wix.com/docs/velo/velo-only-apis/$w/selection-tags/introduction.md ## Article Content: # Introduction Selection Tags let your site visitors choose from a set of options, each displayed as a tag. ![Selection Tags](https://wixmp-833713b177cebf373f611808.wixmp.com/images/velo-images/media_selection_tags2.png "Selection Tags") Selection tags are commonly used to filter page content.