8000 [css-scroll-snap] Resolve issue 6 by removing the section, now that a… · w3c/csswg-drafts@a2be3b3 · GitHub
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[css-scroll-snap] Resolve issue 6 by removing the section, now that a version with it has been published for posterity.
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‎css-scroll-snap/Overview.bs‎

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@@ -299,35 +299,29 @@ Scroll Snapping Rules: the 'scroll-snap-type' property {#scroll-snap-type}
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<dl dfn-type=value dfn-for="scroll-snap-type">
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<dt><dfn>x</dfn>
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<dd>
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The <a>scroll container</a> <a>axis-snaps</a> to <a>snap positions</a>
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The <a>scroll container</a> <a>snaps</a> to <a>snap positions</a>
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in its horizontal axis only.
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<dt><dfn>y</dfn>
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<dd>
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The <a>scroll container</a> <a>axis-snaps</a> to <a>snap positions</a>
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The <a>scroll container</a> <a>snaps</a> to <a>snap positions</a>
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in its vertical axis only.
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<dt><dfn>block</dfn>
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<dd>
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The <a>scroll container</a> <a>axis-snaps</a> to <a>snap positions</a>
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The <a>scroll container</a> <a>snaps</a> to <a>snap positions</a>
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in its block axis only.
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<dt><dfn>inline</dfn>
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<dd>
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The <a>scroll container</a> <a>axis-snaps</a> to <a>snap positions</a>
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The <a>scroll container</a> <a>snaps</a> to <a>snap positions</a>
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in its inline axis only.
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<dt><dfn>both</dfn>
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<dd>
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The <a>scroll container</a> <a>axis-snaps</a> to <a>snap positions</a>
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The <a>scroll container</a> <a>snaps</a> to <a>snap positions</a>
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in both of its axes independently
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(potentially snapping to different elements in each axis).
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<dt><dfn>point</dfn>
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<dd>
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The <a>scroll container</a> <a>point-snaps</a> to <a>snap positions</a> in both axes simultaneously,
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treating each element’s <a>snap position</a> as a single 2D position
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(rather than potentially snapping to different elements in each axis).
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</dl>
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Advisement:
@@ -709,61 +703,6 @@ Types of Scrolling Methods {#scroll-types}
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An <a>axis-locked</a> scroll is bound to only scroll along that axis.
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This prevents less-precise input mechanisms from drifting in the non-primary axis.
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<!--
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-->
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Axis vs Point-Snapping {#snap-dimensions}
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-----------------------------------------
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Issue: This feature is planned to be removed in the next publication
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in order to reduce the feature-set of Level 1.
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It is included here for future reference in defining Level 2.
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There are two distinct <dfn lt="snap behavior|snapping behavior">snapping behaviors</dfn> that a <a>scroll container</a> might engage in:
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: <dfn export local-lt="axis" lt="axis-snapping|axis-snap">axis-snapping</dfn>
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:: If a <a>scroll container</a> is <a>axis-snapping</a>,
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its descendants indicate a desired scroll position
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in each axis of the <a>scroll container</a> independently,
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with no dependent preference for what the other axis’s scroll position should be.
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Note: This is the “default” type of <a>snap behavior</a>
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that most <a>scroll containers</a> will want to use,
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and so the ''scroll-snap-type'' property intentionally defaults to it.
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Note: An element in an <a>axis-snapping</a> <a>scroll container</a>
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can declare two <a>snap positions</a>,
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one in each axis.
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If one of the element’s <a>snap positions</a> is chosen in one axis,
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this has no bearing on the other dimension’s <a>snap position</a>--
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it might be chosen,
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or a different element’s <a>snap position</a> might be chosen for that axis,
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or that axis might not snap at all.
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: <dfn export local-lt="point" lt="point-snapping|point-snap">point-snapping</dfn>
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:: If a <a>scroll container</a> is <a>point-snapping</a>,
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its descendants indicate a desired scroll position
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in both axes of the <a>scroll container</a> simultaneously--
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in other words,
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some point in the descendant must be aligned to a corresponding point in the <a>scroll container</a>.
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This type of <a>snapping behavior</a> is intended for “two-dimensional” panning-type layouts,
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such as cities on a map
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(using ''proximity'' 2D snap positions to snap a city to the center of the display when it gets close),
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or a tiled image gallery
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(using ''mandatory'' 2D snap positions to force each image to be centered on the screen).
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In both of these cases,
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it would look weird if the horizontal scrolling was aligned to one element
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while the vertical was aligned to a different element
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(which is the behavior you’d get if the <a>scroll container</a> was <a>axis-snapping</a>).
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<!--
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@@ -789,23 +728,11 @@ Choosing Snap Positions {#choosing}
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and the final snapped scroll position,
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subject to the additional constraints listed in this section.
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* <a>Point-snapping</a> is all-or-nothing;
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if the <a>snap position</a> of an element is chosen to align to,
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the <a>scroll container</a> must set its scroll position
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according to the element’s <a>snap positions</a> in <em>both</em> axises;
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the <a>scroll container</a> <em>must not</em> “partially align” to the element
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by taking its <a>snap position</a> in one axis
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and aligning the other axis according to something else.
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* If a scroll is <a>axis-locked</a> and the <a>scroll container</a> is <a>axis-snapping</a>,
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* If a scroll is <a>axis-locked</a>,
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any <a>snap positions</a> in the other axis should be ignored
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during the scroll.
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(However, <a>snap positions</a> in the other axis can still effect the final scroll position.)
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If a scroll is <a>axis-locked</a> and the <a>scroll container</a> is <a>point-snapping</a>,
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<a>snap positions</a> should be penalized in the selection process
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according to the amount of other-axis scrolling they would cause.
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* In order to prevent a far-offscreen element
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from having difficult-to-understand effects
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on the scroll position,

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