> For the complete documentation index, see [llms.txt](https://docs.typeset.sh/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.typeset.sh/advanced-guides/javascript.md).
# JavaScript
PDF supports JavaScript for various purposes, such as form validation. However, please note that typeset.sh itself does not parse JavaScript like a browser would. Instead, scripts are attached to the PDF and executed by the client's PDF viewer application.
Not all viewer support all futures and events.
To include `