[Webkit-unassigned] [Bug 270739] New: [CSS Container Queries][Style queries] Incorrect difference between implicit and explicit initial values for custom properties

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=270739

            Bug ID: 270739
           Summary: [CSS Container Queries][Style queries] Incorrect
                    difference between implicit and explicit initial
                    values for custom properties
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kizmarh at ya.ru

Created attachment 470261

  --> https://bugs.webkit.org/attachment.cgi?id=470261&action=review

Screenshot of the test case from Safari TP

Steps to reproduce: 

1. Go to https://codepen.io/kizu/pen/poBgBMb in Safari TP and Chrome and compare how things render.
2. There is a difference in how Safari and Chrome treat the `initial` in the container style query.

It seems that Safari treats the `initial` in style queries for custom properties when it is an _implicit_ value (never explicitly set to `initial`) and when it is explicitly `--foo: initial` differently. In the example above, uncommenting the `--is-lightgreen: initial;` on the root also leads to the difference.

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