planning tpac 2017

TPAC 2017

Meeting Minutes

*Monday, November 6

• Part 1: Sizing
• Part 2: Backgrounds, Grid
• Part 3: Flexbox, Image Decoding, Line Clamping, Cleaning up OWNERS files, Feedback on testing policy
• Part 4: Values and Units, Contains, Line Grid, Line Heights *Tuesday, November 7
• Part 1: .style append/replace, list marker layout, scroll-snap & scrolling APIs
• Part 2: Spatial Navigation, nav-*/tabindex, a11y Joint Meeting
• Part 3: 3D Transforms, Scrollbars, Selectors, Color Spaces
• Part 4: Constructible Style Sheets, ::selection cascade, Multicol

Place, Logistics, etc.

• https://www.w3.org/2017/11/TPAC/
• full TPAC week is 06-10 November 2017
• CSS WG meeting days are Mon-Tue 06-07 from 9am to 6pm
• Houdini meeting is Thu 09 November from 09:00-12:00
  • https://github.com/w3c/css-houdini-drafts/wiki/TPAC-F2F-November-2017
• Burlingame, CA, USA at the Hyatt Regency SFO

Participants

Please, put your name in this table if you plan to participate (alphabetical order by given name):

Name	Arrival	Departure	Hotel	Flight info and notes
Alan Stearns
Dave Cramer	7 Nov	11 Nov	Hyatt Regency SFO	massive conflict with PWG
Emil A Eklund	n/a	n/a	Home	Will miss first two hours on Monday
Eric Willigers	5 Nov	10 Nov
fantasai			AirBnB	likely BART+bicycle
Florian Rivoal	5 Nov	11 Nov	Bay Landing Hotel	KE724+KE023 / KE026+KE723
François REMY	5 Nov	11 Nov	TPAC Hotel	Airplane
Geoffrey Sneddon	5 Nov	18 Nov	Hyatt Regency SFO	Monday only, conflict with WPT on Tuesday; EI3221+EI147 / BA286+BA1488
Javier Fernández	5 Nov	9 Nov	Hyatt Regency SFO	BA7111+BA4271+BA4369
Jen Simmons	29 Oct	10 Nov	AirBnB	airplane to An Event Apart San Fran, plus rental car
Jihye Hong	5 Nov	10 Nov	Holiday Inn Exp SF Airport South
L. David Baron	30 Sep	10 Dec	home	probably BART to Millbrae + walk or bus; will miss roughly 9:00-11:00 Monday (TAG), and possibly 15:00-18:00 Tuesday (AC)
Melanie Richards	5 Nov	9 Nov	Hyatt Regency SFO	Alaska 324, 323
Naina Raisinghani	5 Nov	11 Nov	Crowne Plaza San Francisco Airport
Nat McCully	3 Nov	7 Nov	AirBnB
Peter Linss	5 Nov	11 Nov	Hyatt Regency SFO	YZF-R1
Rachel Andrew	5 Nov	8 Nov	AirBNB
Rob Flack	5 Nov	9 Nov	Holiday Inn Exp SF Airport South
Simon Fraser	n/a	n/a	Local
Simon Pieters	5 Nov	8 Nov	AirBnB	UA 2400 / SK 936
Tab Atkins	local
Tantek Çelik	2017-10-19	2017-12-08	home	ground transport
Tomoya Kimura	5 Nov	12 Nov	Bay Landing Hotel	JL002 / JL001
Greg Whitworth	5 Nov	11 Nov
Xidorn Quan	5 Nov	11 Nov	AirBnB	NZ 8
Lea Verou	5 Nov	13 Nov	Hyatt, then AirBnB
Chris Lilley	5 Nov	13 Nov	Hyatt, then AirBnB
Jet Villegas	6 Nov	7 Nov	home
Brad Kemper	6 Nov	7 Nov	home	Driving
Regrets:

• Koji Ishii, can't make due to a conflict, but would like to call in for text topics if possible.

• Hiroshi Sakakibara, got a severe cold..

See also the current TPAC registrations [member-only].

Schedule

Monday

Morning

• [sizing]
  • max-content size of percentage-sized replaced elements https://github.com/w3c/csswg-drafts/issues/1722
  • Auto-resize iframes and textarea based on content https://github.com/w3c/csswg-drafts/issues/1771
  • intrinsic size of 'overflow: auto/scroll' and its impact on auto-sized grid/flex item ancestors https://github.com/w3c/csswg-drafts/issues/1865 (put on monday)
  • Restrict 'stretch' and 'fit-content' to width/height and max-* https://github.com/w3c/csswg-drafts/issues/1913
  • Define which replaced elements are affected by width: % rule zeroing min-content https://github.com/w3c/csswg-drafts/issues/1889
  • Move min-width and min-height partial definitions to css-sizing https://github.com/w3c/csswg-drafts/issues/1920
• [css-backgrounds] Background-clip and text underline https://github.com/w3c/csswg-drafts/issues/900
• [css-transform] 3d contexts https://github.com/w3c/csswg-drafts/issues/1944
  • Used value of backface-visibility:hidden makes the element a pseudo stacking context (as if having position:relative) if not a stacking context already.
  • A (pseudo) stacking context with backface-visibility:hidden determines the visibility of its background phase and normal-flow phase by computing the face-orientation of its screen matrix. Painting of the phases is skipped if it is back-facing.
• [grid]
  • %s and intrinsic sizes in Grid (tab & fantasai) (put on monday)
  • [css-grid] Percentage tracks and indefinite sizes
  • Basic support for "equal gutter" with justify-content on grid items https://github.com/w3c/csswg-drafts/issues/1116

Afternoon

• Non-interop on sizing images in flexbox (tab & fantasai & jen) (put on monday)
• Image decoding (async or not) [smfr]
• line-clamp (tab & eae?) (https://twitter.com/bfgeek/status/925486371937980416) (put on monday)
• Cleaning up owners files for testing (gregwhitworth)
• WG feedback about testing policy, experience so far, what is needed (zcorpan)
• [css-values] Computed value of a negative calc unit that doesn't allow negative lengths. https://github.com/w3c/csswg-drafts/issues/434
• CSS Contain (Florian)
  • To which box does paint containment clip? https://github.com/w3c/csswg-drafts/issues/1809
  • Clarify style containment effect 1 https://github.com/w3c/csswg-drafts/issues/1872
  • Do scoped counters create new counters https://github.com/w3c/csswg-drafts/issues/1887
  • Becoming a formatting context root vs ruby: what should that do https://github.com/w3c/csswg-drafts/issues/1457
• line height / line spacing related
  • unifying line grid / rhythm / line spacing proposals (dbaron)
  • Baseline considerations for Japanese (Nat) and Math (Daniel)
  • Interop on the line-height property https://github.com/w3c/csswg-drafts/issues/1796 (Florian)
  • Interaction between line grid + size + position https://github.com/w3c/csswg-drafts/issues/1856 (Florian)
  • Clarify lh/rlh with line-height:normal (tbd after issue 1796) https://github.com/w3c/csswg-drafts/issues/1253 Florian
  • Avoiding accidental double spacing (if remote is possible, probably after dbaron's proposal, koji)

Tuesday

Morning

• Interop on List-item outside marker (fremy)
• logical/physical property cascade and the .style API (tabatkins)
• Interaction of scroll-snap and JS scrolling APIs (tab & fantasai) (#1707, #1708)
• Navigation related (Tuesday please)
  • APIs for the spatial focus navigation proposal (jihye)
  • Making spatial navigation properties more composable https://github.com/w3c/csswg-drafts/issues/1910 (Florian)
  • Turning spatial navigation on https://github.com/w3c/csswg-drafts/issues/1940 (Florian)
  • Controlling sequential navigation: https://github.com/w3c/csswg-drafts/issues/1748 + https://github.com/w3c/csswg-drafts/issues/1764 (Florian)

11am: APA/ARIA

11:30am-1pm: 3D transforms breakout.

Afternoon

• scrollbar colors for compat (Tantek)
  • draft: https://github.com/tantek/css-scrollbar-style/blob/master/Overview.bs
• [selectors]
  • Functional pseudo-class like :matches() with 0 specificity https://github.com/w3c/csswg-drafts/issues/1170
  • :target-within? https://github.com/w3c/csswg-drafts/issues/457
• [css-color-4] Working colorspace options (15min, before 2pm, Chris)
• New author proposal for css-transforms-2 [smfr]
• Constructable Stylesheets (tab & eric)
• ::selection cascade
• [css-multicol] Small legacy issues (Rachel)
  • z-order of column-rule and column scrolling https://github.com/w3c/csswg-drafts/issues/1739
  • Text describing column boxes as block container boxes https://github.com/w3c/csswg-drafts/issues/1738
  • Proposal to drop example XVII https://github.com/w3c/csswg-drafts/issues/1740
• [css-multicol] Related issues with regard to column-span (Rachel)
  • How do elements between column-span and its multicol ancestor appear around the span https://github.com/w3c/csswg-drafts/issues/1072
  • Specification should define interaction between 'column-span' and 'column-fill' https://github.com/w3c/csswg-drafts/issues/1075
  • how does absolute positioning work in a containing block that was split by a column-span? https://github.com/w3c/csswg-drafts/issues/1894
• Move Web Animations to CSSWG
• [filter-effects] filter
  • filter should be defined to establish a containing block for fixed and absolutely positioned elements https://github.com/w3c/fxtf-drafts/issues/11
• Root Scroller - proposal to control what element counts as the "root" scroller for the page (David Bokan) - any time except this morning

Thursday

09:00-12:00 Houdini f2f in Cypress C

Proposed Agenda

• [css-fonts-4] Computed value for font-variation-settings https://github.com/w3c/csswg-drafts/issues/1959 (Greg)
• [css-ui-4] appearance (Florian)
  • compatibility with existing content https://github.com/w3c/csswg-drafts/issues/1250
  • what aspect of complex controls to preserve when appearance is none https://github.com/w3c/csswg-drafts/issues/356
  • appearance:none and replaced elements https://github.com/w3c/csswg-drafts/issues/1018
• [css-ui-4] user-select (Florian)
  • user-select on form controls https://github.com/w3c/csswg-drafts/issues/285
  • user-select on generated content and list markers https://github.com/w3c/csswg-drafts/issues/284 (Florian, probably needs to get some WebPlat folks in the room)
• [css-ui-4] Scrollbar styling https://github.com/w3c/csswg-drafts/issues/107 (Florian)
• Prepare snapshot 2018 (Florian)
  • borken indices in the 2017 snapshot https://github.com/w3c/csswg-drafts/issues/1007
  • Copy document conventions (and conformance?) from 2.1 to the snapshot? https://github.com/w3c/csswg-drafts/issues/1867

Scribes list

Monday am

• Greg
• Brian
• Francois Monday pm
• Ian
• Tab
• Emil Tuesday am
• Greg
• Tab Tuesday pm
• Emil
• -your name here-