[Webkit-unassigned] [Bug 241541] New: Treat the composite operator for the bottom mask layer as source-over

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=241541

            Bug ID: 241541
           Summary: Treat the composite operator for the bottom mask layer
                    as source-over
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattwoodrow at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    webkit-bug-importer at group.apple.com, zalan at apple.com

<rdar://93152779>

The composite operator for masks only specifies the mode for combining multiple masks, when drawing the bottom mask we should always draw this with source-over.

https://drafts.fxtf.org/css-masking/#the-mask-composite

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