Specifically, this sentence:

"The second cue has its cue box right aligned at the 90% mark of the video viewport width. The same effect can be achieved with "position:55%,start", which explicitly positions the cue box."

For that to be true, shouldn't the example be:

00:00:03.000 --> 00:00:06.500 position:90%,end size:35%

And not what it is now:

00:00:03.000 --> 00:00:06.500 position:90% align:end size:35%

Since, as I understand it, "align" applies to the text within the box, not the box itself.