[Webkit-unassigned] [Bug 186129] New: REGRESSION CSS animations using steps() timing function no longer work

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186129

            Bug ID: 186129
           Summary: REGRESSION CSS animations using steps() timing
                    function no longer work
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fred.wang at free.fr
                CC: dino at apple.com, simon.fraser at apple.com
            Blocks: 186127

See the attached testcase. Top square uses Bézier timing function (linear) while bottom square uses steps.

On the GTK port, the two squares are animated. On the iOS/macOS ports on trunk with the latest Xcode update (9.4) the bottom square does not move at all. It used to work a few days ago, so probably it's a recent regression in trunk or in XCode 9.4.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=186127
[Bug 186127] [iOS] Tranformation matrix not preserved when pausing complex animation with Bézier timing function
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