[Webkit-unassigned] [Bug 197105] New: CSS perspective property value can only be set correctly once

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197105

            Bug ID: 197105
           Summary: CSS perspective property value can only be set
                    correctly once
           Product: WebKit
           Version: Safari 12
          Hardware: iPhone / iPad
                OS: iOS 12
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ijamardo at google.com

Since iOS 12.2 WebKit is not able to reset the perspective value correctly more than once. This issue is reproducible on both iOS 12.2 Safari and WKWebView and also in OSX Mojave Safari version 12.1. It could be that this is happening in earlier versions.

In order to reproduce, check this W3 School example: https://www.w3schools.com/cssref/trycss3_perspective_inuse.htm

Moving the slider does not correctly modify the perspective CSS value.

Tested on a MacBook Pro with OSX 10.14.4 and on an iPhone 7 Plus with iOS 12.2. It was not happening on iOS 12.0 nor in 11.4.

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