The future of spatial computing is being built on a new web of open source initiatives e.g., Rust & Wasm, which are bringing the performance capabilities needed for spatial computing, previously only available to native applications, to the open web. This talk will look at the challenge of creating an open web stack performative enough to make reality the next platform for computing. Current web technologies, invented decades ago, were for sharing information through interlinked pages on computers not coordinating the activities of humans, machines, and AIs in the real world. The spatial web will need new approaches - code, protocols, and best practices, to create new economies for developers and businesses in spatial communications, AR/VR/XR, healthcare, serious games, robotics & mobile machines (including AVs). From performative rendering and physics to real time collaboration, the spatial web is only just emerging but there are already significant initiatives in key areas. The question remains how can these advances be brought together to create an open web-based ecosystem, i.e. The New Web for Spatial Computing?