This work proposes a WebXR-based cross-platform architecture for developing spatial web apps using the A-Frame and Networked-Aframe frameworks with a view to an open and interoperable metaverse, accessible from both the web and extended reality devices. A prototype was implemented and evaluated, supporting the capability of the proposed technology stack to enable immersive experiences across different platforms and devices. Positive feedback on ease of use of the immersive environment further corroborates the proposed approach, underscoring its effectiveness in facilitating engaging and interactive virtual spaces. This research enriches the discourse on the metaverse by describing an architecture based on web technologies and open standards as opposed to proprietary technologies. By adhering to principles of interoperability and inclusivity, it lives up to Tim Berners-LeeâĂŹs vision of the World Wide Web as an open platform that transcends geographical and technical boundaries.