WebVTT Positioning

What is the expected presentation of the text below?  My expectation is
vertically centered, and to the right of the screen (10% off the edge).  Is
my understanding of WebVTT positioning correct?

Thanks,
David

6
00:00:20.000 --> 00:00:24.000 align:right  position:10%  size:80%  line:50%
 [Middle-Right Water Running]