2025-11 Monthly summary for highcharts/highcharts focused on accessibility improvements and visual reliability. Key feature delivered: Accessibility Marker Graphics Cleanup on Unforced Markers, ensuring that when accessibility markers are unforced, the series is marked dirty to trigger cleanup of marker graphics and maintain correct visuals as accessibility options change. Major bugs fixed: ensuring the series is marked dirty when unforcing accessibility markers, supporting consistent rendering across mode changes. Overall impact: improved accessibility reliability, visual consistency, and user experience for assistive technology users, with a cleaner rendering lifecycle that reduces stale graphics. Technologies/skills demonstrated: strong understanding of rendering lifecycle in Highcharts, accessibility integration, JavaScript/TypeScript, precise commit hygiene and traceability.