Origin trials are a way to test a new or experimental web platform feature. A third-party origin trial makes it possible for providers of embedded content to try out a new feature across multiple sites.
Origin trials are a way to test a new or experimental web platform feature.
Origin trials are usually only available on a first-party basis: they only work for a single registered origin. If a developer wants to test an experimental feature on other origins where their content is embedded, those origins all need to be registered for the origin trial, each with a unique trial token. This is not a scalable approach for testing scripts that are embedded across a number of sites.
Third-party origin trials make it possible for providers of embedded content to try out a new feature across multiple sites.