Molecular visualization is an essential tool for computational chemists and biologists. Due to the demanding nature of three-dimensional (3D) graphics, most molecular viewers are desktop applications. The need to install specialized applications and, in some cases, the restrictive nature of the software licenses, introduces hurdles to the sharing of molecular data. Unlike a desktop application, a standards-based client-side web application comes pre-installed with every computer and mobile device with a modern web browser and can be seamlessly integrated into online environments for accessing and analyzing molecular data.