# M16-GAP-00174 Status

status: done
task: anim.driver_button_add operator LOCAL_EXACT slice
updated: 2026-08-21 America/New_York

scope:

- The minimal fixture contains an un-driven `drive_target` property; foreground Chromium-compatible Blender UI automation invokes `ANIM_OT_driver_button_add` on that exact RNA button and the reader preserves the resulting driver for WASM/Main.

evidence:

- Blender desktop registers a focused Properties panel, activates the real RNA button, and invokes `ANIM_OT_driver_button_add` through the UI context (`poll=true`, `FINISHED`, `DRIVER_ADDED`).
- Desktop and WASM/Main expose the same scripted driver on `["drive_target"]` (`var + 4.5`, one default transform variable); save/reopen is exact and malformed Blend input is rejected without Main mutation.
- Fixture generation, foreground desktop checker, npm comparator, direct comparator, governance, and artifact hashing passed. The checker is idempotent for the already-mutated exact fixture.

nextTask: `M16-GAP-00175`