Cell selection overlay
Marching-ant rectangle drawn over the selected range with a labelled plate and autofill drag handle.
Production answer
Cell selection overlay is a reusable Oak Flats Muffler Men UI primitive with documented states, accessibility expectations, theme behavior, and implementation evidence.
Primary CTAReview Cell selection overlay states
Generative search brief
Cell selection overlay: Marching-ant rectangle drawn over the selected range with a labelled plate and autofill drag handle.
Selection over the quote line-items grid
Behaviour
The plate shows A1 notation and cell count. The corner autofill handle is provided by the AutofillDragHandle primitive. Animation respects prefers-reduced-motion.