csswg-drafts/css-scroll-snap/issues-by-email.txt at 1a4378ca76d8753efb234c2a606358bf079da27f · w3c/csswg-drafts · GitHub

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Original spec, probably represents MS impl? https://rawgit.com/w3c/csswg-drafts/7c784c82310085325b0966414959965675f57f7e/css-snappoints/Overview.html#scroll-snap-type

https://lists.w3.org/Archives/Public/www-style/2013Aug/0224.html

	Issue: Snap offsets should be derived automatically from the layout
	if the descendants of the scrolling container, so that changes to
	that layout don't require manual updating of some property set on
	the container.

	Issue: Define interaction with transforms

	Issue: Guideline that scroll gestures with definite direction
	do not scroll backwards to snap point

	Issue: Allow UAs to not snap when box is larger than scroll-port

	Issue: Define that all user scroll gestures are affected by snapping

	Issue: Define whether script-driven scrolling is affected by snapping

	Issue: Define that layout changes do not trigger resnapping

https://lists.w3.org/Archives/Public/www-style/2013Aug/0226.html

	Issue: Define box-based scroll-snap with per-element padding/offsets

https://lists.w3.org/Archives/Public/www-style/2013Aug/0257.html

	Issue: Allow snapping between multicol columns
	Response: (roc) Create a ::column pseudo-element

https://lists.w3.org/Archives/Public/www-style/2013Aug/0248.html

	Issue: Add scroll jumping feature
	Response: (roc) Ua-defined, could depend on scroll mech

	Issue: Add scroll snappoint repetition length
	Response: (roc) See no use case
		https://lists.w3.org/Archives/Public/www-style/2013Aug/0253.html

	Issue: Use logical directions
	Response: (roc) Layout isn't always logical
		https://lists.w3.org/Archives/Public/www-style/2013Aug/0253.html
	Response: (howcome) Axis isn't usually WM defined, but direction is
		https://lists.w3.org/Archives/Public/www-style/2013Aug/0258.html

https://lists.w3.org/Archives/Public/www-style/2013Oct/0570.html

	Issue: Snap "discretely", rather than smoothly scrolling, like spreadsheets do.

	Issue: Need to snap to elements.

https://lists.w3.org/Archives/Public/www-style/2013Oct/0571.html
		https://lists.w3.org/Archives/Public/www-style/2013Oct/0574.html

	Issue: Maybe need implicit snap points at 0/end, but also there are use-cases for not doing it.
	(Using snap-points for pull-to-refresh, for example, to hide the "pulled" part initially.)

https://lists.w3.org/Archives/Public/www-style/2013Oct/0574.html

	Issue: Need to be able to scroll an overly-large element without it forcing a snap, even if it's "mandatory".

https://lists.w3.org/Archives/Public/www-style/2013Dec/0058.html

	Issue: Change name to css-scrollsnap, as we're not snappint points.

	Issue: scroll-snap-type is too verbose. Shorten to scroll-snap?

	Issue: Independent control over vert and horiz snapping is needed. (Scrolling through a vertical snapped list of items, but some might overflow.)

	Issue: What should we do when when we're snapped, then the element moves?
	For proximity, maybe okay to do nothing, but mandatory should re-snap.

	Issue: Proposal for adding edges of an element's margin or border box to the list of available snap points,
	in https://wiki.mozilla.org/index.php?title=Gecko:CSSScrollSnapping

	Issue: Given element-based snapping, need ability to say "none" in scroll-snap-points-x/y

	Issue: What should we do if mandatory snapping, but no snap points?
	Suggestion, snap to zero.

https://lists.w3.org/Archives/Public/www-style/2013Dec/0064.html

	Issue: Snap to grid lines?

https://lists.w3.org/Archives/Public/www-style/2013Dec/0284.html

	Issue: Propose that when doing element-snapping,
	automatically decide which edge to snap based on the direction you're scrolling.
	Eg, snap bottom edge when scrolling down.

https://lists.w3.org/Archives/Public/www-style/2013Dec/0303.html

	Issue: Need a way to snap to the center of an element.

	Issue: Need a way to snap while "peeking" the next/prev thing a little bit.

https://lists.w3.org/Archives/Public/www-style/2013Dec/0375.html

	Issue: Add DOM stuff [no clue what stuff, Tab you'll have to elaborate]
	Response: (roc) Use scrollTop and scrollLeft
		https://lists.w3.org/Archives/Public/www-style/2013Dec/0384.html

https://lists.w3.org/Archives/Public/www-style/2013Dec/0384.html

	Issue: Might be nice to have API to get snap destinations

https://lists.w3.org/Archives/Public/www-style/2014Jan/0591.html

	Issue: Stop ignoring my feedback
	Response: (rakow) I'm going to work on it
		https://lists.w3.org/Archives/Public/www-style/2014Jan/0592.html

	Issue: Independent scroll-snap-type per axis
	Response: (rakow) This interferes with 2D snapping
		https://lists.w3.org/Archives/Public/www-style/2014Jan/0592.html

	Issue: Don't see use case for scroll-snap-points-x/y given elements

	Issue: "leading edge" used without definition
	Response: (rakow) Replced with "start edge"
		https://lists.w3.org/Archives/Public/www-style/2014Oct/0436.html

	Issue: "scroll-snap-axis-x/y" poorly named
	Response: (rakow) Renamed to "scroll-snap-destination"
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0000.html

	Issue: "scroll-snap-coordinate-x/y" poorly named

	Issue: Reference to box, doesn't say whether margin/padding/content box

	Issue: Initial value of "scroll-snap-coordinate-x/y" bad
	Response: (rakwo) Added 'none' as initial value
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0000.html

	Issue: "scroll-snap-position-x/y:elements" seems unnecessary.
	Just always snap to elements (union with -position lengths)

https://lists.w3.org/Archives/Public/www-style/2014Jan/0592.html

	Issue: Need to be able to do 2d snapping, such as cities on a map snapping to the center of the viewport.

	Issue: Need to handle overly-large elements. (collapse this issue's duplicates later ;)

	Issue: Elements with multiple "points of interest" that can all be snapped to?
	Response: Roc suggests just using dummy elements, or script.
		https://lists.w3.org/Archives/Public/www-style/2014Jan/0594.html

https://lists.w3.org/Archives/Public/www-style/2014Feb/0607.html

	Use case: scrolling through photo album, want to snap each image to center of screen,
	or slightly offset from center.

	Use case: scrolling through photo album, want to present it "film-strip" style N at a time.

	Use case: scrolling a large map, want to snap cities to the center when they're close, or slightly offset from center.

	Issue: Make sure zooming doesn't interfere with snapping,
	or make it act in a weird/unpredictable manner.
	Response: (rakow) Specified that visual viewport snaps, not layout viewport
		https://lists.w3.org/Archives/Public/www-style/2014Oct/0436.html

	Issue: Remove the "elements" value from scroll-snap-points-x/y, and just merge the lists together.
	Response: (rakow) Removed
		https://lists.w3.org/Archives/Public/www-style/2014Oct/0436.html

	Issue: Have the children determine the scroll snapping beahvior (proximity, mandatory), rather than container.

	Issue: Some syntactic concerns (hyphenization, commas)

	Issue: Multiple snap-points per element?

	Issue: Make sure this works with box-sizing, and uses consistent terminology.

https://lists.w3.org/Archives/Public/www-style/2014Feb/0815.html

	Issue: Remove snap-list/snap-interval in favor of element-snapping
	Response: (rakow) snap-interval needed for paging
		https://lists.w3.org/Archives/Public/www-style/2014Feb/0829.html
	Rebuttal: (roc) don't think this is user-friendly
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0025.html

	Issue: Use commas in functional notation
	Response: (rakow) Following CSS conventions
		https://lists.w3.org/Archives/Public/www-style/2014Feb/0829.html
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0032.html

	Issue: Case of elements snapping to different points

	Issue: Initial value of scroll-snap-coordinate is bad
	Response: (rakow) Gonna fix it
		https://lists.w3.org/Archives/Public/www-style/2014Feb/0829.html

	Issue: Bunch of stuff probably not needed? (not sure what stuff)
	Response: (rakow)
		https://lists.w3.org/Archives/Public/www-style/2014Feb/0829.html

	Issue: Underdefined which box we're relative to

	Issue: Per-gesture snapping points (top vs bottom depending on direction)
	Response: (Rakow) This is weird and bad
		https://lists.w3.org/Archives/Public/www-style/2014Feb/0829.html
	Rebuttal: (roc) Disagree, not having this is bad. However, only works
	for items fully in the scrollport
		https://lists.w3.org/Archives/Public/www-style/2014Feb/0829.html
	Response: (rakow) You're wrong, there are more use cases than that.
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0014.html

https://lists.w3.org/Archives/Public/www-style/2014Feb/0816.html

	Issue: Start with focus on box-snapping, not length snapping.
	Length snapping hard-codes assumptions, doesn't react to layout.
	Lengths may be useful, but they are not useful for the simple
	cases. Handle the simple cases well first.

https://lists.w3.org/Archives/Public/www-style/2014Feb/0830.html
		https://lists.w3.org/Archives/Public/www-style/2014Feb/0829.html

	Use case: Handle redfin filmstrip (repeat 9 photos, 10 photos visible)
	Response: (roc) Use container.scrollBy(container.clientWidth, 0, {behavior:"smooth"})
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0062.html

https://lists.w3.org/Archives/Public/www-style/2014Mar/0008.html

	Issue: Mandatory snapping should be disabled when box fills viewport
	Response: (rakow) Changing behavior based on size is confusing
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0014.html
	Rebuttal: (roc) Authors are dumb, we have to help users
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0025.html

https://lists.w3.org/Archives/Public/www-style/2014Mar/0014.html

	Issue: Use case for baseline alignment

	Use case: Spreadsheet, snapping rows/columns to start/start
	Response: (roc) Spreadsheet scrolling behavior is evil
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0025.html

	Use case: Text editor, snapping top line with top
	Response: (roc) Use case is imaginary afaict
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0025.html

https://lists.w3.org/Archives/Public/www-style/2014Mar/0025.html

	Issue: Add 'snap' parameter to CSSOM ScrollOptions

https://lists.w3.org/Archives/Public/www-style/2014Mar/0046.html

	Issue: scroll-snap-points syntax needs work
	Response: Okay
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0074.html
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0075.html
		https://lists.w3.org/Archives/Public/www-style/2014Mar/0106.html

https://lists.w3.org/Archives/Public/www-style/2014Aug/0397.html

	Issue: What to do when the end of the box isn't a snap point, and type is mandatory?
	Bounce, or assume there's one there anyway?
	Response: Francois says omitting the end can be useful to do pull-to-refresh behaviors at end.
		https://lists.w3.org/Archives/Public/www-style/2014Aug/0427.html

https://lists.w3.org/Archives/Public/www-style/2014Sep/0282.html

	Bunch of use cases, need to evaluate

https://lists.w3.org/Archives/Public/www-style/2014Oct/0029.html

	Response: Direction-based snapping is wrong

	Issue: Remove scroll-snap-points-x/y

	Issue: Specify box (margin/border) plus offsets

	Issue: scroll-snap-coordinate/destination are terrible names

https://lists.w3.org/Archives/Public/www-style/2014Oct/0436.html

	Response: Mandatory snap points must resnap when layout shifts

	Response: Removed scroll-snap-points-x/y offset list

	Response: Deferring snap areas, per-axis snap type, snappoint links, APIs

https://lists.w3.org/Archives/Public/www-style/2014Oct/0474.html

	Issue: Better define the actual snapping behavior,
	preferably in terms of the CSSOM scroll position concept.

	Issue: Define behavior when there's no snap points,
	or there are some snap points but none within the valid scrolling range.

	Issue: Define behavior of repeat(0px) or repeat(-1px).
	Response: Disallowed zero/negative. https://lists.w3.org/Archives/Public/www-style/2014Oct/0480.html
	Further issue now - this violates "no open ranges" :(

	Issue: Add "none" value to scroll-snap-points-x/y
	Response: Did it. https://lists.w3.org/Archives/Public/www-style/2014Oct/0480.html

	Issue: Rename scroll-snap-coordinate to scroll-snap-target.
	Response: "target"+"destination" confusing, maybe rename both?
		https://lists.w3.org/Archives/Public/www-style/2014Oct/0480.html

https://lists.w3.org/Archives/Public/www-style/2014Nov/0086.html

	Issue: Need to specify what happens when there's no reachable snappoint, or no snappoints at all.
	Propose that no snapping occurs if there are none,
	or that we scroll as far as possible toward the snappoint if it's unreachable.

	Issue: Concern wrt implementability of resnapping to layout changes

	Issue: Clarify whether JS scrollTop setting causes resnapping

https://lists.w3.org/Archives/Public/www-style/2015Jan/0009.html

	Issue: What behavior when start/end of scroll container aren't snappoints?

	Issue: Maybe specify how a fast fling can "skip over" snap points?

	Issue: HANDLE OVERLY-LARGE ELEMENTS

https://lists.w3.org/Archives/Public/www-style/2015Mar/0153.html

	Issue: Removing 'elements' keyword makes it tricky to turn snapping off
	Response: (rakow) Use scroll-snap-type as toggle
		https://lists.w3.org/Archives/Public/www-style/2015Mar/0154.html

	Issue: Layout affecting whether scrollbars appear can affect snapping containership
	Response: (rakow) Switched to keying off of 'overflow' computed value
		https://lists.w3.org/Archives/Public/www-style/2015Mar/0154.html
	Issue: Need to consider 'overflow: hidden'
		https://lists.w3.org/Archives/Public/www-style/2015Mar/0156.html
	Response: (rakow) Key off 'scroll' or 'auto'?
		https://lists.w3.org/Archives/Public/www-style/2015Mar/0157.html

https://lists.w3.org/Archives/Public/www-style/2015Apr/0103.html

	Issue: Handle overly-large elements (don't snap when the next snappoint is well off the screen).
	--Are you sure about that? I thought the issue was about scoping -- don't snap to points off the screen,
	even if all items are small.

https://lists.w3.org/Archives/Public/www-style/2015May/0248.html

	Issue: scroll-snap-coordinate needs per-axis control

https://lists.w3.org/Archives/Public/www-style/2015May/0282.html

	Issue: Elements value is needed to trap scroll-snap contributions,
	for cases where author decides to remove scrollability.
	Response: (smfr) Less sure about this now...
		https://lists.w3.org/Archives/Public/www-style/2015Jun/0147.html

	Issue: Repeat seems unnecessary

	Issue: Current proposal doesn't handle varying viewport sizes (overlarge elements issue)

	Issue: Authors want snapping to boxes

https://lists.w3.org/Archives/Public/www-style/2015Jun/0147.html

	Issue: Nested scrollers issue -- need scrollers to trap snappoints
	Response: (majid) Separate capture from snapping
		https://lists.w3.org/Archives/Public/www-style/2015Jun/0159.html
	Response: (rakow) Need some way to specify capture, maybe "elements"?
		https://lists.w3.org/Archives/Public/www-style/2015Jun/0376.html
	Response: (majid) That doesn't prevent pass-through on scrollers.
	Need to be associated to nearest scrollable ancestor, but only
	snap if 'elements' is specified.
		https://lists.w3.org/Archives/Public/www-style/2015Jul/0035.html
	Response: (rakow)
		* Scrollability is defined by 'auto' or 'scroll' computed value
		* Scrollability in an axis captures snappoints in that axis
		* Do we really need snapping to pass through per axis?
		* Priorities of nested snapping vs 2D snapping?
		https://lists.w3.org/Archives/Public/www-style/2015Jul/0457.html

https://lists.w3.org/Archives/Public/www-style/2015Jun/0148.html

	Issue: How to determine what element handles the snappoints of its descendants.
	In particular, how do abspos work when there's a scroll container between them and their containing block?
	Response: (rakow) Should use containing block chain, but need term
		https://lists.w3.org/Archives/Public/www-style/2015Jun/0376.html

https://lists.w3.org/Archives/Public/www-style/2015Jun/0150.html

	Issue: Define interaction of scroll-snap-points-x/y and scroll-snap-coordinate

https://lists.w3.org/Archives/Public/www-style/2015Jun/0159.html

	Note: FF implements axis-separate snap-type

	Issue: Scroll-snap-coordinate needs x/y longhands

https://lists.w3.org/Archives/Public/www-style/2015Jun/0170.html

	Issue: 1D vs 2D snapping

https://lists.w3.org/Archives/Public/www-style/2015Jun/0230.html

	Issue: Snapping behavior for DOM APIs: scrollTo/scrollLeft/scrollTop/scrollIntoView
	Response: (roc) No snapping for DOM Apis, but add 'snap' value to ScrollOptions
		https://lists.w3.org/Archives/Public/www-style/2015Jun/0231.html
	Response: (rakow) Always snap to snappoints
		https://lists.w3.org/Archives/Public/www-style/2015Jun/0376.html

https://lists.w3.org/Archives/Public/www-style/2015Jul/0036.html

	Issue: Handle calc() values in repeat()

	Issue: Handle 0 in repeat()

	Response: (tab) Use 1px as enforced minimum
		https://lists.w3.org/Archives/Public/www-style/2015Jul/0075.html


https://lists.w3.org/Archives/Public/www-style/2015Jun/0376.html

	Issue: Adding back 'elements' should make snap-points-x/y and elements mutually exclusive
	Response: (majid) Are there really no merged use cases?
		https://lists.w3.org/Archives/Public/www-style/2015Jul/0035.html
	Response: (rakow) Can't think of a single one
		https://lists.w3.org/Archives/Public/www-style/2015Jul/0453.html

https://lists.w3.org/Archives/Public/www-style/2015Jul/0035.html

	Issue: Way to make start/end of scrollable area snappable
	Response: (rakow) Can't see a use case -- interval syntax includes it
	implicitly, and for elements, there's no element there anyway
		https://lists.w3.org/Archives/Public/www-style/2015Jul/0453.html

	Issue: Scroll APIs need to be able to evade snap restrictions

https://lists.w3.org/Archives/Public/www-style/2015Jul/0046.html

	Issue: Having some JS operations snap and others not is weird

https://lists.w3.org/Archives/Public/www-style/2015Jul/0085.html

	Issue: Add 'snap' parameter to scroll APIs: preserves back compat
	and expectations, but allows snapping when wanted

https://lists.w3.org/Archives/Public/www-style/2015Jul/0452.html

	Response: No, really, we need to resnap always otherwise authors
	have to do it themselves manually.

https://lists.w3.org/Archives/Public/www-style/2015Jul/0458.html

	Issue: How do we react to a snappoint that goes away?
	(Element deleted, style modified to remove the snap coord.)
	Response: (rakow) UA-defined, usually nearest or next element is good
		https://lists.w3.org/Archives/Public/www-style/2015Jul/0479.html
	Response: (roc, tab) Need to specify for interop
		https://lists.w3.org/Archives/Public/www-style/2015Aug/0000.html

	Issue: If snapping follows an element as it moves, when does this occur?
	Response: (rakow) After OM/layout/display competes, provided no active scroll event
		https://lists.w3.org/Archives/Public/www-style/2015Jul/0479.html

https://lists.w3.org/Archives/Public/www-style/2015Aug/0000.html

	Issue: How should we react to a snappoint outside the scrollable area?
	MS seems to consider it "invalid",
	Safari keeps it choosable and scrolls as close as possible if it's chosen.
	(Consider behavior when an element moves and its corresponding snappoint shifts slightly outside the scrollable area.)

https://lists.w3.org/Archives/Publ
342D
ic/www-style/2014Oct/0029.html

	Issue: No use-case for scroll-snap-points-x/y. Just drop it.

	Issue: scroll-snap-coordinate needs to allow specifying which box to use (margin vs border)

	Issue: scroll-snap-coordinate/destination are terrible names.