232908 2021-11-09 15:14:05 -0800 OffscreenCanvasRenderingContext2D.fillStyle does not support system colors in Workers 2026-03-13 02:42:23 -0700 1 1 1 Unclassified WebKit Canvas WebKit Local Build Unspecified Unspecified NEW InRadar P2 Normal --- 232918 183720 1 heycam webkit-unassigned dino kkinnunen webkit-bug-importer oldest_to_newest 1813361 0 heycam 2021-11-09 15:14:05 -0800 Assigning a system color to an OffscreenCanvas 2D context's fillStyle or strokeStyle doesn't work. This is causing WPTs html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.parse.system{,.worker}.html to fail. 1813362 1 webkit-bug-importer 2021-11-09 15:17:25 -0800 <rdar://problem/85225723> 2189959 2 kkinnunen 2026-03-13 02:42:23 -0700 LayoutTests/imported/w3c/web-platform-tests/html/canvas/offscreen/fill-and-stroke-styles/2d.fillStyle.parse.system.worker.html is the only one failing now. Fails due to RenderTheme not being thread-safe, static OptionSet<CSS::ColorType> allowedColorTypes(ScriptExecutionContext* scriptExecutionContext) turning of system color types.