26020 2014-06-09 15:13:36 +0000 [WebVTT] Support centering a cue whose lines are not themselves centered 2014-06-11 11:44:51 +0000 1 1 1 Unclassified TextTracks CG WebVTT unspecified PC All NEW P2 normal --- 26021 1 philipj dave.null philipj silviapfeiffer1 public-texttracks oldest_to_newest 107535 0 philipj 2014-06-09 15:13:36 +0000 https://www.w3.org/Bugs/Public/show_bug.cgi?id=25632#c25 https://www.w3.org/Bugs/Public/show_bug.cgi?id=25632#c27 Use case: "You have a cue with several short lines and you want their left edges to align. Then you want to position the bounding box of those lines so that it is centered around a fixed point beneath the speaker." 107538 1 philipj 2014-06-09 15:19:46 +0000 I had one proposal for this in https://www.w3.org/Bugs/Public/show_bug.cgi?id=25632#c27 but I think it would be better with a solution where the correct text-align value is used from the start and only the cue position is adjusted to achieve the same result. Unfortunately I don't know if that's even possible. It might be a good idea to consult with CSS and SVG experts to see if they've thought about something like this before. SVG has a text-anchor attribute, but it doesn't really do the same thing because it's only for a single line: https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/text-anchor 107539 2 nigel.megitt 2014-06-09 15:23:29 +0000 Flagging up that we have the same requirement in TTML, with a proposed mapping to CSS flex box for display purposes [1]. It'd be neat to converge on the mapping for display purposes, though obviously the syntax will be different. [1] https://www.w3.org/wiki/TTML/changeProposal015#multiple_row_alignment_.28flex_box_in_CSS_mapping.29 107553 3 philipj 2014-06-09 21:50:47 +0000 That's interesting. It looks like one can use e.g. justify-content: flex-end to right-align the content of a flex box. That makes me wrong, because apparently you can do this thing in CSS, which makes me somewhat less skeptical of it. 107649 4 philipj 2014-06-11 11:44:51 +0000 When fixing this, don't forget to revisit the maximum size calculation: https://github.com/w3c/webvtt/pull/105#issuecomment-45603644