One of the areas of interest and pain points for developers appears to be placement of subtitles and captions in a spherical video, as this is much more complex than on a flat video given that the pose is always changing.
The immersive-custom-elements is a great module to leverage for developers wanting to include 360-video support into their websites at the present time, however it would still benefit web developers with support for automatic subtitle placement.
At TPAC 2019 there was interest around standardization for spherical video: https://github.com/immersive-web/proposals/issues/55
One of the areas of interest and pain points for developers appears to be placement of subtitles and captions in a spherical video, as this is much more complex than on a flat video given that the pose is always changing.
The immersive-custom-elements is a great module to leverage for developers wanting to include 360-video support into their websites at the present time, however it would still benefit web developers with support for automatic subtitle placement.
This issue descibes this need in more detail.