X3D version 4.0 was approved by Web3D Consortium and ISO in 2023.
X3D version 4.0 offers many new features including interoperability with HTML5, glTF
2.0 Physically Based Rendering (PBR), and Web Audio API.
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<meta name='info' content='Correct definition and compliance of this conformance scene is maintained by the X3D
Working Group, https://www.web3d.org/working-groups/x3d'/>