# Lesson 3 complete; MDN Using IndexedDB not read

Learner finished lesson 0003 (quiz/path) and did **not** read the primary sources (MDN Using IndexedDB, optional web.dev idb walkthrough). Treat as known from the lesson: all work is transactional; readonly vs readwrite; put vs add; get/getAll/delete/clear; auto-commit; do not await unrelated async mid-transaction; “saved” ≈ transaction complete. Depth from the native API walkthrough is still open — lesson 4 will re-anchor indexes/cursors with MDN and can double as a light backfill on transactions if needed. Next ZPD: indexes, key ranges, and when cursors beat dump-everything getAll.