CTA’s Audio and Video Systems Committee (R4) launched a new project CTA-CEB-32.8-C, Practice for ATSC 3.0 Television Sets, Application Runtime Environment. This bulletin makes recommendations related to the capabilities of ATSC 3.0 Television Sets as they relate to the handling of the Application Runtime Environment of ATSC 3.0 signals. The Application Runtime Environment includes Application Program Interface (API) descriptions that allow HTML5 applications to interface with ATSC 3.0 enabled devices for inclusion of an interactive ATSC 3.0 Service.