[Webkit-unassigned] [Bug 249151] New: perspective calc() values aren't clipped to 0

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249151

            Bug ID: 249151
           Summary: perspective calc() values aren't clipped to 0
           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: graouts at webkit.org

The "perspective" property is specified to only allow non-negative values: https://www.w3.org/TR/css-transforms-2/#perspective-property. However, we don't clip values that would be computed to less than 0, for instance using a calc() expression, and instead deem them invalid internally and thus consider as if "none" was provided, which has implications when blending as blending with "none" means a discrete behavior should be used.

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