[Webkit-unassigned] [Bug 191865] New: [css-scroll-snap] scroll snap align two value parsing is incorrect/backwards

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191865

            Bug ID: 191865
           Summary: [css-scroll-snap] scroll snap align two value parsing
                    is incorrect/backwards
           Product: WebKit
           Version: Safari 12
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: majidvp at chromium.org

CSSWG has resolved [1] to change the ordering of scroll-snap-align property to be in "block inline" order. WebKit parsing logic appear to do "inline, block" order.
I have changed Chromium implementation to match the specification but it is now different from Safari.
The current usage of two value is low but as it grows the interop issue problem grows.

Additional links:
- My backward compat analysis suggested the risk is low [2]
- Relevant WPT test [3].


I tested this on Safari 12.0.1.

[1] https://github.com/w3c/csswg-drafts/issues/2232
[2] https://github.com/w3c/csswg-drafts/issues/2232#issuecomment-399961633
[3] https://wpt.fyi/results/css/css-scroll-snap/snap-inline-block.html?label=stable&aligned

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