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. X3D/head/meta identifier (url) content should start with http:// or 'https:// <ShaderPart DEF='' value=''/> needs to be contained by a <ComposedShader> node rather than a <ComposedShader> node <ShaderPart DEF='' value=''/> needs to be contained by a <ComposedShader> node rather than a <ComposedShader> node <DISEntityTypeMapping DEF=''/> containerField='children'incorrect, must be containerField='mapping'> to match parent DISEntityManager' <DISEntityTypeMapping DEF=''/> containerField='children'incorrect, must be containerField='mapping'> to match parent DISEntityManager' <DISEntityTypeMapping DEF=''/> containerField='children'incorrect, must be containerField='mapping'> to match parent DISEntityManager' <DISEntityTypeMapping DEF=''/> containerField='children'incorrect, must be containerField='mapping'> to match parent DISEntityManager' <Group DEF='AvatarHolder'/> element has no child node