diff --git a/plans/hs-conformance-to-100.md b/plans/hs-conformance-to-100.md
index ac7810f5..cdf8f82d 100644
--- a/plans/hs-conformance-to-100.md
+++ b/plans/hs-conformance-to-100.md
@@ -52,7 +52,7 @@ Each cluster below is one commit. Order is rough — a loop agent may skip ahead
 
 9. **[done (+4)] `wait on event` basics** — `wait / can wait on event`, `on another element`, `waiting ... sets it to the event`, `destructure properties in a wait` (4 tests). Event-waiter suspension issue. Expected: +3-4.
 
-10. **[in-progress] `swap` variable ↔ property** — `swap / can swap a variable with a property` (1 test). Swap command doesn't handle mixed var/prop targets. Expected: +1.
+10. **[done (+1)] `swap` variable ↔ property** — `swap / can swap a variable with a property` (1 test). Swap command doesn't handle mixed var/prop targets. Expected: +1.
 
 11. **[pending] `hide` strategy** — `hide / can configure hidden as default`, `can hide with custom strategy`, `can set default to custom strategy`, `hide element then show element retains original display` (4 tests). Strategy config plumbing. Expected: +3-4.
 
@@ -158,6 +158,9 @@ Many tests are `SKIP (untranslated)` because `tests/playwright/generate-sx-tests
 
 (Reverse chronological — newest at top.)
 
+### 2026-04-24 — cluster 10 swap variable with property
+- **30f33341** — `HS: swap variable with property (+1 test)`. Mock `El` class in `tests/hs-run-filtered.js`: `dataset` is now a `Proxy` that forwards property writes to `attributes["data-*"]`, and `setAttribute("data-*",...)` populates the backing dataset with camelCase key. That way `#target.dataset.val = "new"` updates the `data-val` attribute so the swap command can read+write the property correctly. Suite hs-upstream-swap: 3/4 → 4/4. Smoke 0-195: 162/195 unchanged.
+
 ### 2026-04-24 — cluster 9 wait on event basics
 - **f79f96c1** — `HS: wait on event basics (+4 tests)`. Five parts: (a) `tests/hs-run-filtered.js` `io-wait-event` mock now registers a one-shot listener on the target element and resumes with the actual event (was unconditionally `doResume(null)`). (b) New `hs-wait-for-or target event-name timeout-ms` runtime form carrying a timeout; mock resumes immediately when timeout is present (covers 0ms tests). (c) `parser.sx` `parse-wait-cmd` recognises `wait for EV(v1, v2)` destructure syntax, emits `:destructure (names)` on the wait-for AST. (d) `compiler.sx` `emit-wait-for` handles :from/:or combos; new `__bind-from-detail__` form compiles to `(define v (host-get (host-get it "detail") v))`; the `do`-sequence handler pre-expands wait-for with destructure into the plain wait-for plus synthetic bind forms. (e) generator extracts `detail: ...` from CustomEvent option blocks. Suite `hs-upstream-wait`: 3/7 → 7/7. Smoke 0-195: 162/195 unchanged.