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chromium/third_party/blink/web_tests/external/wpt/webvtt/parsing/file-parsing/tests/support/whitespace-chars.vtt 

WEBVTT

spaces
   00:00:00.000    -->  00:00:01.000 
   text0

tabs
			00:00:00.000				-->		00:00:01.000	
text1

form feed
00:00:00.000-->00:00:01.000
text2

vertical tab
00:00:00.000-->00:00:01.000
invalid