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='TODO' content='multiliingual translation parameter'/> <meta name='warning' content='under development, scene Sound/AudioClip triggering (or retrieved file format) not working'/> <meta name='warning' content='TODO resolve potential error in Script node TextScript: parse problem line 15 " var strategy = [];'/>