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04:08:38 <trackbot> Meeting: CSS-SVG Task Force Teleconference
04:08:38 <trackbot> Date: 03 July 2018
04:13:44 <krit> present+
04:13:47 <leaverou> present+
04:13:58 <Rossen> present+
04:13:58 <birtles> present+
04:14:00 <philipwalton> present+
04:14:01 <iank_> present+
04:14:03 <ericwilligers_> ericwilligers_ has joined #fx
04:14:06 <TabAtkins> present+
04:14:24 <ericwilligers_> present+
04:14:52 <ericwilligers_> Scribenick: ericwilligers
04:15:26 <Rossen> Topic: [css-transforms] Smarter interpolation of truncated transform lists
04:15:46 <Rossen> github: https://github.com/w3c/csswg-drafts/issues/927
04:16:20 <jihye> present+
04:16:56 <ericwilligers_> Brian: (summarizing) There was a proposal for when we have mismatched transform lists to do something smarter than matrix interpolation
04:17:42 <ericwilligers_> Brian: We resolved on some behavior (April 2017) but when implementing, spec text did not match what was discussed in WG.
04:18:26 <ericwilligers_> Brian: We implemented what is in spec text but we want to do something smarter: interpolate common denominator and use matrix interpolation for the remainder
04:19:01 <ericwilligers_> s/denominator/prefix/
04:19:25 <ericwilligers_> dirk: do other implementers also want to change?
04:19:48 <ericwilligers_> dino: we should do this: go as far as you can, smoosh the rest
04:20:43 <ericwilligers_> ian: will have to check with Waterloo team
04:21:19 <ericwilligers_> rossen: no objection
04:22:39 <ericwilligers_> pad the shorter one with identity functions, find the common prefix.
04:23:02 <ericwilligers_> interpolate common prefix pairwise, interpolate the rest matrix-wise
04:23:37 <ericwilligers_> dirk: proposal from fantasai to do the same from the right if they have a common suffix.
04:24:15 <ericwilligers_> tab: don't like it - common to have ambiguous situations
04:24:32 <ericwilligers_> dirk: agree
04:24:56 <ericwilligers_> tab: prefer prefix over suffix, prefer not to try to do both
04:25:03 <birtles> I agree
04:27:27 <ericwilligers_> RESOLVED: pad the shorter one with identity functions, find the common prefix, interpolate common prefix pairwise, interpolate the rest matrix-wise.
04:28:30 <Rossen> Topic: Explicitly specify that a transform is a containing block for all descendants
04:28:38 <Rossen> github: https://github.com/w3c/csswg-drafts/issues/913
04:29:21 <ericwilligers_> dirk: because of the compositing model of many browsers,  much the same reason as for filter effects
04:29:46 <ericwilligers_> rossen: this means it will also be a containing block for fixed?
04:31:20 <ericwilligers_> rossen: is there interop?
04:31:59 <birtles> dbaron has a test for some of these cases https://dbaron.org/css/test/2018/stacking-context-z-order
04:33:15 <ericwilligers_> ericwilligers: motion path and individual transform properties explicitly create a containing block and stacking context.
04:34:22 <ericwilligers_> rossen: seems like transform in Edge and Chrome and Firefox is considered a containing block.
04:37:28 <ericwilligers_> brian: transform-style flat creates a stacking context in the spec but not implementations.
04:38:40 <ericwilligers_> dirk: some developers don't like the behavior - some want fixed-pos to not create a containing block even if there is a transform.
04:38:56 <ericwilligers_> dbaron: it is a little late to change that.
04:39:53 <ericwilligers_> dbaron: I tried this on 4 engines. Notes at the bottom of test linked above.
04:40:42 <ericwilligers_> dbaron: This is testing many different things. Green means it does the thing, red means it does not.  Sometimes does not correspond to pass/fail.
04:41:14 <ericwilligers_> crossed out means the engine does not implement property.
04:42:32 <ericwilligers_> dirk: confirm WebKit behaves same as Edge and Chrome and Firefox  in creating a containing block.
04:45:39 <ericwilligers_> dirk: will we resolve for filter too?
04:46:43 <ericwilligers_> RESOLVED: transform establishes a containing block for all elements.
04:47:55 <dino> ericwilligers_: Didn't we resolve to add a few options for transform-box?
04:48:02 <dino> ericwilligers_: it's already in the spec
04:48:35 <dino> ericwilligers_: i'm just noting that there have been differences since the most recent publication
04:48:58 <dino> Topic: CSS Transforms Last Call
04:49:19 <dino> dbaron: Last call doesn't exist any more. Do you mean CR?
04:49:34 <dino> krit: I don't know what it is called. But I meant Last Call.
04:49:56 <dino> ericwilligers_: the concern is that there is no interop for transform-box
04:50:02 <dino> dbaron: that's fine for entering CR
04:50:14 <dino> Rossen: we should definitely go to CR
04:50:20 <dino> once the changes are in
04:50:33 <dino> Rossen: Dirk, are you going to do the work preparing for CR?
04:50:35 <dino> krit: yes
04:50:42 <dino> krit: i'll work with Chris Lilley
04:50:54 <dino> Rossen: any objections to taking transforms level 1 to CR
04:51:08 <dino> RESOLVED: Publish CSS Transforms Level 1 as a CR
04:51:43 <dino> Topic: Updating Editors for Web Animations
04:51:55 <dino> birtles: supposedly we need WG approval to change editors
04:52:10 <dino> birtles: shane and doug are currently editors but can no longer continue
04:53:00 <dino> birtles: i propose adding Robert Flack (Google), Stephen McGruer (Google), Antoine Quint (Apple). The latter two need to join the WG.
04:53:18 <dino> Rossen: we can't add them while they are not members. Add Flack now.
04:53:43 <dino> Rossen: objections to adding Flack?
04:53:50 <dino> none
04:54:07 <dino> Rossen: any objections to adding McGruer and Quint when they become CSS members?
04:54:09 <dino> none
04:54:26 <dino> RESOLVED: Add these new editors
04:54:41 <dino> s/editors/editors of Web Animations/
04:55:08 <dino> Topic: Any more animations or transitions issues
04:55:19 <dino> birtles: not many that are worth discussing
04:55:48 <dino> birtles: i'm blocked on moving definitions into values and units. Tab and fantasai offered to help. They can't continue to live in transitions.
04:56:18 <dino> birtles: the other issue is i need to redo a lot of WPT because they are not very reliable. We've disabled a bunch in gecko due to flakiness.
04:56:29 <dino> birtles: this makes it hard to edit the spec and make more tests
04:56:36 <dino> birtles: i need to get those fixed
04:57:41 <dino> krit: maybe eric wants to discuss filter on root?
04:57:54 <dino> Rossen: we might need simon for this. what is it about?
04:59:32 <dino> Rossen: i think we discussed this 2 weeks ago, and we need a lot more investigation. It will happen on github.
05:00:18 <dino> Rossen: we are adjourned
05:12:50 <Rossen> trackbot, end meeting
05:12:50 <trackbot> Zakim, list attendees
05:12:50 <Zakim> As of this point the attendees have been krit, leaverou, Rossen, birtles, philipwalton, iank_, TabAtkins, ericwilligers_, jihye
05:12:58 <trackbot> RRSAgent, please draft minutes
05:12:58 <RRSAgent> I have made the request to generate https://www.w3.org/2018/07/03-fx-minutes.html trackbot
05:12:59 <trackbot> RRSAgent, bye
05:12:59 <RRSAgent> I see no action items