This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.
msIsStereo3D is a read-only property which determines whether the system considers the loaded video source to be stereo 3-D or not.
This proprietary property is specific to Internet Explorer and Microsoft Edge.
Boolean value set to true indicates that the video source is stereo 3D.
This uses metadata set in MP4 or MPEG-2 file containers and H.264 Supplemental enhancement information (SEI) messages to determine the stereo capability of the source.