[Webkit-unassigned] [Bug 166946] New: REGRESSION: Applying ::before to a pseudo-element no longer works

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=166946

            Bug ID: 166946
           Summary: REGRESSION: Applying ::before to a pseudo-element no
                    longer works
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dcrousso+webkit at gmail.com

The styles added by https://webkit.org/b/148120 no longer work.  `input[type=range]::-webkit-slider-runnable-track { ... }` still works, but adding `::before` to the rule has no effect.

As an aside, neither of the two rules show up in the styles sidebar (even with Shadow DOM visible).

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