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 title (i.e. filename 'MyBounce.x3d') is expected at end of identifier (url) value It is good practice to identify editor(s) used, for example <meta name='generator' content='X3D-Edit, https://savage.nps.edu/X3D-Edit'/> <Script DEF='Bounce2'> <field name='translation_changed' accessType='outputOnly'/> does not send output event via assignment statement translation_changed=___;