Origin trial

Act An origin trial is Chrome's mechanism for shipping an experimental web-platform feature to real sites for a limited time before deciding whether to ship it broadly: a developer registers a specific origin, receives a token, and includes that token as a meta tag or HTTP header so the feature activates for visitors to that origin without requiring them to flip browser flags. Trials are time-limited, usage-limited, and feed feedback back to the Chrome team; some ("deprecation trials") instead let a site keep a feature that has been removed elsewhere a little longer. Firefox and Edge run comparable programmes. WebMCP, which lets a page register tools an agent embedded in the browser can call, entered a Chrome 149 origin trial announced 9 June 2026, meaning any exposure to it today is experimental and origin-scoped rather than a shipped, universally available API. Used by: webmcp.