X3DOM is a JavaScript library that brings declarative 3D to HTML pages. The 3D content is fully integrated with the DOM and accessible via all standard DOM libraries (e.g., jQuery). This 2-part presentation covers the extensions to X3DOM necessary for X3DOM running in a browser to support mobile devices and provide VR content. The first part covers existing X3DOM capabilities and how W3C handles device orientation. The second part covers the new nodes necessary to support mobile devices and VR/AR support.