[Webkit-unassigned] [Bug 184417] New: CSS: filter should reject negative brightness

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=184417

            Bug ID: 184417
           Summary: CSS: filter should reject negative brightness
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ericwilligers at chromium.org

https://drafts.fxtf.org/filter-effects/#FilterProperty

brightness() = brightness( <number-percentage> )
Negative values are not allowed.

However, WebKit and Blink currently accept negative values.
https://jsfiddle.net/ericwilligers/y4j8hzvs/

Corresponding Blink bug:
https://bugs.chromium.org/p/chromium/issues/detail?id=776208

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