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. <meta name='warning' content='under development: euler-angle conversions still problematic, single-step animation reveals that animations are not smooth.'/> <TimeSensor DEF='ClockTimer'/> is inactive since enabled='false' (and no ROUTE is provided to change this value)