Trusted Types (https://developer.mozilla.org/en-US/docs/Web/API/Trusted_Types_API) was originally implemented and launched in Chromium in 2019, and has since found use in numerous websites. It has recently gained interest from other browser vendors. The Trusted Type spec was co-written as a "monkey patch" spec along with our original implementation. It now receives fresh attention as others are trying to implement the same spec. It has now been "upstreamed" into HTML + DOM (plus a bit of CSP). As part of that process, various inconsistencies are being identified and fixed. Some of these fixes may be developer observable. This intent is to update our implementation to match the spec, as it's upstreamed into HTML. Meanwhile, WebKit has launched their implementation of the updated Trusted Types spec, which gives us high confidence that this update is highly web compatible.
The Trusted Types spec has been upstreamed into HTML, with some minor cleanups and changes. Our implementation should follow the updated spec to ensure cross-browser compatibility. Spec: https://w3c.github.io/trusted-types/dist/spec/ + https://html.spec.whatwg.org/