[css-scroll-snap] Is scroll-snap-type: [ mandatory | proximity ] valid CSS? · Issue #827 · w3c/csswg-drafts · GitHub
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[css-scroll-snap] Is scroll-snap-type: [ mandatory | proximity ] valid CSS? #827

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whsieh opened this issue Dec 22, 2016 · 2 comments
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[css-scroll-snap] Is scroll-snap-type: [ mandatory | proximity ] valid CSS? #827

whsieh opened this issue Dec 22, 2016 · 2 comments
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@whsieh
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whsieh commented Dec 22, 2016 •
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Link: https://drafts.csswg.org/css-scroll-snap/

According to the spec, values of scroll-snap-type follow the format none | [ x | y | block | inline | both ] [ mandatory | proximity ]?, which I understand to mean that values like x mandatory or block are valid, but mandatory alone is not. However, in Section 2 (Motivating Examples) I noticed that scroll-snap-type: mandatory; and scroll-snap-type: proximity; are utilized. Is the intention to make those valid values for scroll-snap-type?

If they are, would it make sense to make the default axis type both when only proximity or mandatory are specified?
@whsieh whsieh changed the title [css-scroll-snap] Is scroll-snap-type: [ mandatory | proximity ] valid CSS? [css-scroll-snap] Is scroll-snap-type: [ mandatory | proximity ] valid CSS? Dec 23, 2016
@fantasai
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Good catch. The CSSWG resolved on requiring the axis arguments (usually you want just one axis or the other, not both--both results in weird scrolling behavior on a normal document). The examples didn't get updated, though.

@fantasai
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(Tab and I had originally proposed to use whichever axis is scrollable, defaulting to the block axis if both are, but we couldn't get agreement on that so now it's a required argument.)

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