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='Note that X3D Canonicalization (C14N) will scrub alternate XML character representations, be careful to check original encoding into version control.'/> <meta name='warning' content='Usually this source document needs to be inspected and edited using a plain-text editor in order to see the differences in these XML-equivalent text representations.'/> <Text DEF='' string='"I don't think so" "" "he said \"Hi\""'/> has 8 quote marks with at least one escaped quote mark \" so double-check to ensure paired "quote marks" for each line are matched <Text DEF='' string='"I don't think so" "" "he said \"Hi\""'/> has 8 quote marks with at least one escaped quote mark \" so double-check to ensure paired "quote marks" for each line are matched