WEBVTT - Example of cues with leading/trailing spaces
header with trailing spaces     
header with trailing tabs		
  header with leading spaces
		header with leading tabs
    
previous line has spaces only
		
previous line has tabs only

00:11.000 --> 00:13.000
This cue has trailing spaces      

00:13.000 --> 00:16.000
    and that one leading spaces

00:16.000 --> 00:18.000
that one trailing tabs			

00:18.000 --> 00:20.000
		leading tabs here

00:20.000 --> 00:22.000
cue with intermediate spaces/tabs only lines
     
		

00:22.000 --> 00:24.000
next cues contains only spaces and tabs

00:24.000 --> 00:26.000
     

00:26.000 --> 00:28.000
			

