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.
It is good practice to identify editor(s) used, for example <meta name='generator'
content='X3D-Edit, https://savage.nps.edu/X3D-Edit'/>
<Sphere DEF=''/> geometry node must have Shape node as parent
<Sphere DEF=''/> geometry node must have Shape node as parent
<Appearance DEF=''/> found outside of a parent Shape, ProtoBody, field or fieldValue element
<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