Relation between maximum cue size, cue alignment and text position

Hello everyone,

I'm having trouble understanding the correlation between the *maximum
size*, the *cue alignment* and text position. I'm sorry if I'm missing
something really obvious.

According to these definitions,
1) A WebVTT alignment cue setting configures the alignment of the text
*within the cue*
2) A WebVTT text position cue setting configures the position of the
text in the direction orthogonal to the WebVTT line position cue
setting. For horizontal cues, this is the horizontal position.

I have the following scenario:
- One cue with two lines of text in the top left corner (implying text
position = 0%)
- The text within the cue should be centered (implying cue alignment = middle)

Now, according to the computational step,
3.5.10.5) Determine the value of maximum size for cue as per the appropriate
rules from the following list:
[...]
If the text track cue alignment is middle, the text track cue text
position is less than or equal to 50
Let maximum size be the text track cue text position multiplied by two.
[...]

We get the maximum size = 2 * (text position) = 0

Then later, 3.5.10.6) sets size to min(cueSize, maximumSize), which is
used 3.5.10.7) to set the 'width' to 'size vw', which is the actual
CSS width of 0vw.

I understand the intention of the spec, probably to have maximum size
set to the remaining width from the text position, but what am I
mis-reading?

Thank you,
Victor

Received on Wednesday, 18 April 2012 23:42:10 UTC