At RDC 2026, Roblox announced plans to launch games on Chrome without a separate installation before the end of the year. For single-player offline mode in the authors' games, the target date is mid-2027.
Source published September 11th: This is a roadmap and not a confirmation that all features will be available on October 7th. Game authors must separately enable support for offline play. The promised browser version starts with Chrome; support for other browsers is said to be a next step. Therefore, before choosing a device, check the actual way to launch the desired world, and not just the general announcement of the platform.
Sources and checks
RDC 2026: The World Needs More Play · Roblox Corporation
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