WEBVTT
Either size or alignment are invalid.

1
00:00:00.000 --> 00:00:30.500 size:100% align:@start
Bear is Coming!!!!!
Box for the cue is 100% of the video viewport width, alignment is ignored.

2
00:00:31.000 --> 00:01:00.500 size:-10% align:end
I said Bear is coming!!!!
Box for the cue is as big as the text, no line wrapping,
(except if viewport is too small) and end aligned.

3
00:01:01.000 --> 00:02:00.500 size:110% align:@end
I said Bear is coming now!!!!
Both cue size and alignment are ignored.