What's the benefit of WEBVTT(.vtt) over SubReal (.srt)?
Probably people just like to reinvent wheel.
The only difference I see is that vtt supports subtitle positioning on screen.
Disclaimer: I am the author of https://github.com/mantas-done/subtitlesI have implemented several subtitle formats including .srt and .vtt. Every one of those 5 formats is very similar: spaces vs no spaces, commas vs periods.
WebVTT has very robust features, including font, color and text formatting, and placement. Initially SRT couldn’t support any formatting, but it’s been upgraded to support basic text formats (bold, italic, underline) and placement. However, it doesn’t have nearly the same capabilities as VTT. source