infrastructure and a strong type system that enforces memory safety and data race freedom. When making design decisions we will prioritize the features of the modern web platform that are amenable to high-performance almost any design with concurrent JS and layout, JS is going to be waiting to query layout sometimes, perhaps often. This will be the most opportune time to run the GC. For information on the design of WebXR browser implementation, parallel layout, etc.: How Browsers Work - basic explanation of the common design of modern web browsers by long-time Gecko engineer Ehsan Akhgari More how browsers work article that