[Webkit-unassigned] [Bug 145874] New: @supports parse error with the filter property when no parameter is specified

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=145874

            Bug ID: 145874
           Summary: @supports parse error with the filter property when no
                    parameter is specified
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: phiw2 at l-c-n.com

Created attachment 254708
  --> https://bugs.webkit.org/attachment.cgi?id=254708&action=review
test case

@supports (filter:blur()) or (-webkit-filter: blur()) { /* do something */ } is parsed as valid by Webkit but not by Firefox (the rules inside the `@supports` block are applied by Webkit nightly builds). Note the missing parameter for the  blur value.

Chromium based browsers appear to suffer from the same issue (tested with Opera 30).

Note: 
1. Webkit handles this correctly for `@supports (transform:scale()) {}` and ignores everything inside the @supports block.
2. -webkit-backdrop-filter: blur() is also affected

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