Summary:
The scroll snap specification has been significantly changed since we
implemented. scroll-snap-coordinate, scroll-snap-destination and
scroll-snap-points-{x,y} were dropped, instead, scroll-snap-align,
scroll-snap-margin and scroll-snap-padding were added in the spec. Also,
scroll-snap-type was changed to a longhand property and its syntax was
changed in the spec.
Due to the scroll-snap-type change, this migration will happen
irreversibly
in terms of the scroll-snap-type property. Once the change happens in bug
1312163 [1], you can no longer use the old longhands,
scroll-snap-type-{x,y},
and no longer use the old shorthand syntax like `scroll-snap-type:
mandatory`.
That means that, for example, sites specifying only scroll-snap-type-x will
be broken. To mitigate it, I am going to land a bunch of relevant stuff
at the
same time so that we can switch to the new scroll snap at once.
Bug:
A meta bug is
https://bugzilla.mozilla.org/show_bug.cgi?id=1231777
Link to standard:
https://drafts.csswg.org/css-scroll-snap-1/
Platform coverage: all
Estimated or target release: Firefox 68
Preference behind which this will be implemented:
layout.css.scroll-snap-v1.enabled
Is this feature enabled by default in sandboxed iframes?
Yes
DevTools bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1133666
Do other browser engines implement this?
Chrome and Safari already shipped
web-platform-tests:
http://w3c-test.org/css/css-scroll-snap/
Additional notes:
scroll-snap-stop which was introduced in the new spec is not going to be
implemented now since it's marked at-risk in the spec
Thanks,
hiro
[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1312163
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