X3D version 4.0 was approved by Web3D Consortium and ISO in 2023.[/X3D, diagnostic]
X3D version 4.0 offers many new features including interoperability with HTML5, glTF
2.0 Physically Based Rendering (PBR), and Web Audio API.[/X3D, diagnostic]
Missing X3D filename in meta tag, should appear as <meta name='title' content='FileName.x3d'/>
[/X3D/head, warning]
Correct url for X3D file should appear in <meta name='identifier' content='https://someAddress/somePath/FileName.x3d'/>
[/X3D/head, warning]
Missing X3D scene description in meta tag, should appear as <meta name='description'
content='topic sentence plus good summary'/> [/X3D/head, info]
It is good practice to identify editor(s) used, for example <meta name='generator'
content='X3D-Edit, https://savage.nps.edu/X3D-Edit'/> [/X3D/head, info]
<FontStyle DEF='LABEL_FONT'/> array justify='"MIDDLE"' has only 1 value for major-axis
justification, add another value for minor-axis
justification:  "BEGIN" "END" "FIRST" "MIDDLE" (default is "FIRST") [/X3D/Scene/Group/Transform/Billboard/Shape/Text/FontStyle, warning]