Here are a couple of direct links to specs:
* [https://drafts.css-houdini.org/css-typed-om/ CSS Typed OM Level 1]
* [https://drafts.css-houdini.org/worklets/ Worklets Level 1] (needed for Paint)
* [https://drafts.css-houdini.org/css-paint-api/ CSS Paint API Level 1]