WEBVTT

 leading space
00:00:00.000 --> 00:00:01.000
{"id":" leading space"}

trailing space 
00:00:00.000 --> 00:00:01.000
{"id":"trailing space "}

-- >
00:00:00.000 --> 00:00:01.000
{"id":"-- >"}

->
00:00:00.000 --> 00:00:01.000
{"id":"->"}

 
00:00:00.000 --> 00:00:01.000
{"id":" "}