Subitles in ttml format don't work over internet - by nino

TTML Simple Delivery Profile for Closed Captions (US)
A profile of TTML for internet delivery of Captions originated in the United States
W3C Working Group Note 05 February 2013
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Good day people. Can someone explain why this subtitles in ttml format works 
off-line (in private browsing) but not on-line. Are there any restictions (like server 
must be located in US or on server must be set MIME type for ttml format or what)?

Thanky you for any answer. 
kind regards, nino

Subtitles in ttml format; 
http://www.instant-singlica.asia/video/IE11Video/PM_karaoke_sdp.htm