Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 4d19ac74260ea32ba7e31d2560f0ac94fa28503f
      
https://github.com/WebKit/WebKit/commit/4d19ac74260ea32ba7e31d2560f0ac94fa28503f
  Author: Charlie Wolfe <[email protected]>
  Date:   2026-09-24 (Thu, 24 Sep 2026)

  Changed paths:
    M 
LayoutTests/imported/w3c/web-platform-tests/html/canvas/element/compositing/2d.composite.operation.darker-expected.txt
    M 
LayoutTests/imported/w3c/web-platform-tests/html/canvas/offscreen/compositing/2d.composite.operation.darker-expected.txt
    M 
LayoutTests/imported/w3c/web-platform-tests/html/canvas/offscreen/compositing/2d.composite.operation.darker.worker-expected.txt
    M Source/WebCore/platform/graphics/GraphicsTypes.cpp

  Log Message:
  -----------
  Canvas globalCompositeOperation should not accept the legacy "darker" operator
https://bugs.webkit.org/show_bug.cgi?id=324762
rdar://188035440

Reviewed by Kimmo Kinnunen.

parseCompositeAndBlendOperator() accepts "darker" and maps it to 
CompositeOperator::PlusDarker, but
"darker" is not a valid canvas composite mode per the HTML spec, so assigning 
it should be ignored
and leave the previous value in place. Make parseCompositeAndBlendOperator() 
fail to parse "darker".

* 
LayoutTests/imported/w3c/web-platform-tests/html/canvas/element/compositing/2d.composite.operation.darker-expected.txt:
* 
LayoutTests/imported/w3c/web-platform-tests/html/canvas/offscreen/compositing/2d.composite.operation.darker-expected.txt:
* 
LayoutTests/imported/w3c/web-platform-tests/html/canvas/offscreen/compositing/2d.composite.operation.darker.worker-expected.txt:
* Source/WebCore/platform/graphics/GraphicsTypes.cpp:
(WebCore::parseCompositeAndBlendOperator):

Canonical link: https://commits.webkit.org/321811@main



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