diff --git a/TREE.md b/TREE.md
index ea4dd26..2c506e6 100644
--- a/TREE.md
+++ b/TREE.md
@@ -351,6 +351,8 @@ research/evolution/EvolutionReport.md
research/evolution/README.md
research/evolution/context.json
research/evolution/cycles/2026-09-27-navigation-effort.json
+research/evolution/cycles/2026-09-27-navigation-focus-effort.json
+research/evolution/cycles/2026-09-27-navigation-focus.md
research/evolution/cycles/2026-09-27-navigation.md
research/evolution/ledger.json
research/evolution/profiles.json
@@ -400,6 +402,9 @@ research/experiments/matrix-recovery/provenance.json
research/experiments/matrix-recovery/result.json
research/experiments/navigation-history/README.md
research/experiments/navigation-history/experiment.mjs
+research/experiments/navigation-history/focus-policy.js
+research/experiments/navigation-history/focus-result.json
+research/experiments/navigation-history/focus.mjs
research/experiments/navigation-history/initial-partial.json
research/experiments/navigation-history/package-lock.json
research/experiments/navigation-history/package.json
@@ -423,6 +428,7 @@ research/reviews/LocalFirstAdmissionScreen.json
research/reviews/LocalFirstEvidenceExpansion.md
research/reviews/MatrixRecoveryExperiment.md
research/reviews/NavigationCoverage.md
+research/reviews/NavigationFocusExperiment.md
research/reviews/NavigationHistoryExperiment.md
research/reviews/NavigationRenderingEvidence.md
research/reviews/NestedDismissalIsolation.md
diff --git a/research/candidates/FocusReturn.md b/research/candidates/FocusReturn.md
index 910b1c8..875de54 100644
--- a/research/candidates/FocusReturn.md
+++ b/research/candidates/FocusReturn.md
@@ -74,3 +74,14 @@ requires application policy. This supports separating input ownership from focus
restoration, not a general production-ready fix: animated exits, competing owners,
rapid input bursts and assistive technology remain untested. Sixteen hypotheses;
no new pattern or maturity promotion.
+
+## Boundary with route continuation — 2026-09-27
+
+[Navigation focus contrast](../reviews/NavigationFocusExperiment.md) NF02–NF06
+provides a non-modal counter-context: a successful route may continue at a new heading,
+while failed navigation keeps the invoker and background work leaves focus alone.
+A held response must respect focus moved to a surviving search field. Raw htmx in
+this fixture restores a same-ID link; that behavior alone does not choose the next
+task. Preserve this candidate's modal scope instead of treating every route change
+as a return-to-invoker problem. No general route-focus pattern or AT validation is
+admitted; delayed history restoration and competing navigation remain open.
diff --git a/research/candidates/ProgressiveEnhancement.md b/research/candidates/ProgressiveEnhancement.md
index 64e4add..54dc834 100644
--- a/research/candidates/ProgressiveEnhancement.md
+++ b/research/candidates/ProgressiveEnhancement.md
@@ -50,3 +50,18 @@ native recovery link navigates successfully. This does not establish automatic f
late-script safety, accessible focus/announcements or offline availability.
See [NH01–NH06](../reviews/NavigationHistoryExperiment.md). One authored application
with a real package, not independent deployed recurrence. Hypothesis retained.
+
+## Keyboard continuation and feedback — 2026-09-27
+
+[Navigation focus experiment](../reviews/NavigationFocusExperiment.md) NF01–NF06
+distinguishes successful route continuation, failed navigation, history restoration
+and background updates. In the raw fixture, a replacement link retains focus but
+fragment navigation leaves the old title and failures produce no visible status.
+The authored policy updates title/status, selects a heading for direct continuation
+and preserves a surviving control when the user has moved focus during the request.
+
+Choose a continuation policy for the task; do not universally focus a heading or
+return to the invoker. Check ownership when the response is applied, not only when
+it is requested. Failure feedback need not move focus. Same-ID restoration is not
+proof of semantic continuity. DOM/ARIA checks here do not establish spoken feedback;
+AT, delayed history and overlapping-request behavior remain unverified.
diff --git a/research/catalog/SourceCatalog.md b/research/catalog/SourceCatalog.md
index c9d35b5..fca224d 100644
--- a/research/catalog/SourceCatalog.md
+++ b/research/catalog/SourceCatalog.md
@@ -173,3 +173,19 @@ binaries. Authored HTTP application; 18 browser cases plus explicit HTTP validat
sequence repeated twice. [NH01–NH06 review](../reviews/NavigationHistoryExperiment.md),
preregistered prospective corroboration. This is one implementation family, not
an independent production deployment. Initial launch failure receipt preserved.
+
+## Navigation focus and feedback — 2026-09-27
+
+SRC-0038 follow-up: [NF01–NF06](../reviews/NavigationFocusExperiment.md), separate
+focus runner and authored policy using the same pinned htmx fixture family. 22
+registered keyboard/DOM rows; not assistive-technology validation or independent use.
+
+SRC-0039: [W3C Understanding Focus Order](https://www.w3.org/WAI/WCAG22/Understanding/focus-order.html)
+and [Status Messages](https://www.w3.org/WAI/WCAG22/Understanding/status-messages.html),
+primary interpretive guidance accessed 2026-09-27; living revision unknown. One W3C
+family, not two application uses. NF review limits the inference to meaningful focus
+order and programmatically exposed feedback; no conformance claim from this fixture.
+
+SRC-0040: [htmx events](https://htmx.org/events/), lifecycle-hook reference accessed
+2026-09-27, living revision unknown. Same htmx family as SRC-0018/0019 and SRC-0038.
+Runtime conclusions use pinned 2.0.11 code and hashed receipts.
diff --git a/research/evolution/EvolutionReport.md b/research/evolution/EvolutionReport.md
index 545d758..d301334 100644
--- a/research/evolution/EvolutionReport.md
+++ b/research/evolution/EvolutionReport.md
@@ -22,7 +22,7 @@ Independent human profile reviews: 0/17. Full-contract independent-use counts un
## Change since baseline
-Baseline baseline-2026-09-26; source revision `f273a190f0e08b8cfe0bb7260d0e7d889f1c090a`. Added: 0; removed: 0; shared candidates with changed content: 2; changed evidence/review assessments: 2; maturity transitions: 0.
+Baseline baseline-2026-09-26; source revision `f273a190f0e08b8cfe0bb7260d0e7d889f1c090a`. Added: 0; removed: 0; shared candidates with changed content: 3; changed evidence/review assessments: 3; maturity transitions: 0.
The shared cohort is compared separately from additions. Changed text or evidence counts are not learning gains.
@@ -51,13 +51,13 @@ Ten selected retrospective outcomes (not a historical census), followed by prosp
| Outcome | Entries (not independent discoveries) |
| --- | ---: |
-| corroboration | 1 |
+| corroboration | 2 |
| inconclusive | 0 |
| merge | 0 |
| rejection | 0 |
| revision | 10 |
-Cycles with recorded research effort: 1/11. Unknown effort is neither zero nor estimated from commits, tokens or assertion counts.
+Cycles with recorded research effort: 2/12. Unknown effort is neither zero nor estimated from commits, tokens or assertion counts.
### Stream B / B-navigation-mechanism-v1
@@ -67,11 +67,19 @@ Cycles with recorded research effort: 1/11. Unknown effort is neither zero nor e
One bounded question counts at most one consequential outcome. Corroboration and inconclusive work remain visible separately. Fewer than three comparable cycles: no trend assessment.
+### Stream F / F-navigation-focus-v1
+
+| Cycle | Outcome | Research minutes | Consequential outcome/hour |
+| --- | --- | ---: | ---: |
+| LEARN-0012 | corroboration | 5.138 | 0.00 |
+
+One bounded question counts at most one consequential outcome. Corroboration and inconclusive work remain visible separately. Fewer than three comparable cycles: no trend assessment.
+
## Coherence and maintainability
Profile hashes and local references passed validation when this report was generated. That checks traceability, not source truth or external URL freshness.
-Profiles with unknown last substantive review date: 15. Assessment dates record this metadata review, not a new substantive validation. No age-based freshness claim is available for those profiles.
+Profiles with unknown last substantive review date: 14. Assessment dates record this metadata review, not a new substantive validation. No age-based freshness claim is available for those profiles.
Coherence metrics (ambiguous selections, unjustified relations and overlap resolved): not measured. Conflict Copy / Explicit Reconciliation overlap remains an explicit open question.
@@ -230,8 +238,9 @@ Keep essential actions usable when enhancement is unavailable.
| documentary | htmx | Boosted links and forms. | [NavigationRenderingEvidence](../../research/reviews/NavigationRenderingEvidence.md) |
| documentary | SvelteKit | Form actions and rendering/page options. | [NavigationRenderingEvidence](../../research/reviews/NavigationRenderingEvidence.md) |
| runtime | htmx in authored public-catalog fixture | NH01–NH06: native/enhanced routes, history hit/miss, actual browser cache ordering and missing-Vary negative control; explicit Node validator checks separate. | [NavigationHistoryExperiment](../../research/reviews/NavigationHistoryExperiment.md) |
+| runtime | htmx in authored public-catalog fixture | NF01–NF06: Tab/Enter navigation, raw versus authored focus/status policy, held-response ownership and background update; DOM evidence only, not AT speech. | [NavigationFocusExperiment](../../research/reviews/NavigationFocusExperiment.md) |
-Open limits: Independent deployed full-contract recurrence remains unverified. Keyboard/focus/announcements, late-script activation, interrupted transport, invalid/deleted routes, offline availability and real intermediary behavior remain open.
+Open limits: Independent deployed full-contract recurrence and human/AT validation remain unverified. Focus visibility, delayed history, overlapping requests, late-script activation, interrupted transport, invalid/deleted routes, offline availability and real intermediaries remain open.
Superseded by: none recorded.
@@ -318,8 +327,9 @@ Restore meaningful focus after a temporary interaction ends.
| documentary | WAI-ARIA APG | Dialog focus obligations. | [PatternBreadthExpansion](../../research/reviews/PatternBreadthExpansion.md) |
| static-code | Radix | Pinned layer/listener ownership implementation. | [NestedDismissalIsolation](../../research/reviews/NestedDismissalIsolation.md) |
| runtime | Radix | Authored fixture: raw 20/24 versus routed 24/24; browser/build limits retained. | [NestedOwnershipRouting](../../research/reviews/NestedOwnershipRouting.md) |
+| runtime | htmx in authored public-catalog fixture | NF01–NF06: Tab/Enter navigation, raw versus authored focus/status policy, held-response ownership and background update; DOM evidence only, not AT speech. | [NavigationFocusExperiment](../../research/reviews/NavigationFocusExperiment.md) |
-Open limits: One implementation family; repeated trials are not independent uses. Animated exits and competing owners remain untested; no production repair claim.
+Open limits: One implementation family; repeated trials are not independent uses. Animated exits and competing owners remain untested; no production repair claim. Route continuation is a contrasting context, not independent modal-pattern recurrence; delayed history and AT speech unverified.
Superseded by: none recorded.
@@ -495,3 +505,17 @@ Evidence: [NavigationHistoryExperiment](../../research/reviews/NavigationHistory
Remaining uncertainty: One authored application, no independent recurrence or usefulness gain. Accessibility, delayed scripts, interrupted transport, real intermediaries and offline availability remain open.
Supersedes: none recorded.
+
+### LEARN-0012 — Does enhanced route replacement need explicit continuation and feedback policy that respects changed focus ownership?
+
+2026-09-27 · stream F · prospective · corroboration
+
+Before: Native controls alone do not establish enhanced focus/feedback semantics; delayed responses should respect focus moved to another surviving task. Modal return is not automatically route continuation.
+
+Conclusion: Corroborated in 22 cases: raw same-ID link focus survives but this fragment contract leaves stale title and silent failure; authored heading/status policy works and preserves newer search focus. No AT speech or universal heading policy established.
+
+Evidence: [NavigationFocusExperiment](../../research/reviews/NavigationFocusExperiment.md), [focus-result](../../research/experiments/navigation-history/focus-result.json), [2026-09-27-navigation-focus-effort](../../research/evolution/cycles/2026-09-27-navigation-focus-effort.json).
+
+Remaining uncertainty: Author-model DOM evidence, no human/AT validation or independent recurrence. Delayed history focus, competing requests, delayed scripts and interrupted enhancement remain open.
+
+Supersedes: none recorded.
diff --git a/research/evolution/cycles/2026-09-27-navigation-focus-effort.json b/research/evolution/cycles/2026-09-27-navigation-focus-effort.json
new file mode 100644
index 0000000..beadc2b
--- /dev/null
+++ b/research/evolution/cycles/2026-09-27-navigation-focus-effort.json
@@ -0,0 +1,34 @@
+{
+ "start": 198900.113504947,
+ "execution_seconds": 31.501304913981585,
+ "executions": [
+ {
+ "command": [
+ "node",
+ "research/experiments/navigation-history/focus.mjs"
+ ],
+ "seconds": 17.86536105797859,
+ "exit_code": 0
+ },
+ {
+ "command": [
+ "make",
+ "evolution-check",
+ "evolution-test",
+ "schema-test",
+ "bench-test"
+ ],
+ "seconds": 13.635943856002996,
+ "exit_code": 0
+ }
+ ],
+ "status": "complete",
+ "start_utc_approx": "2026-09-26T22:16:12.694172+00:00",
+ "end_utc": "2026-09-26T22:21:52.471986+00:00",
+ "elapsed_seconds": 339.778,
+ "research_minutes": 5.138,
+ "execution_minutes": 0.525,
+ "method": "Single-agent monotonic elapsed session minus blocking experiment/check subprocess durations. Checkpoint inspection assigned to execution; no double count. Rounded minute fields are elapsed agent effort, not human labor or model compute.",
+ "excluded": "Orientation before clock; final receipt refresh, commit, snapshot and State Hub sync after cutoff. Tokens and cost unknown.",
+ "budget": "Within preregistered 45 active research / 10 execution minute budget."
+}
diff --git a/research/evolution/ledger.json b/research/evolution/ledger.json
index fa33cfa..f4e41a4 100644
--- a/research/evolution/ledger.json
+++ b/research/evolution/ledger.json
@@ -373,6 +373,43 @@
"cost_usd": null
},
"supersedes": []
+ },
+ {
+ "id": "LEARN-0012",
+ "date": "2026-09-27",
+ "recording": "prospective",
+ "stream": "F",
+ "comparison_group": "F-navigation-focus-v1",
+ "protocol_ref": "research/evolution/cycles/2026-09-27-navigation-focus.md",
+ "question": "Does enhanced route replacement need explicit continuation and feedback policy that respects changed focus ownership?",
+ "previous_belief": "Native controls alone do not establish enhanced focus/feedback semantics; delayed responses should respect focus moved to another surviving task. Modal return is not automatically route continuation.",
+ "conclusion": "Corroborated in 22 cases: raw same-ID link focus survives but this fragment contract leaves stale title and silent failure; authored heading/status policy works and preserves newer search focus. No AT speech or universal heading policy established.",
+ "disposition": "corroboration",
+ "affected_patterns": [
+ "CAND-0010",
+ "CAND-0016"
+ ],
+ "evidence": [
+ "research/reviews/NavigationFocusExperiment.md",
+ "research/experiments/navigation-history/focus-result.json",
+ "research/evolution/cycles/2026-09-27-navigation-focus-effort.json"
+ ],
+ "remaining_uncertainty": [
+ "Author-model DOM evidence, no human/AT validation or independent recurrence.",
+ "Delayed history focus, competing requests, delayed scripts and interrupted enhancement remain open."
+ ],
+ "reviewer": {
+ "name": "Codex",
+ "role": "author-model",
+ "independent_human": false
+ },
+ "effort": {
+ "research_minutes": 5.138,
+ "execution_minutes": 0.525,
+ "reported_tokens": null,
+ "cost_usd": null
+ },
+ "supersedes": []
}
]
}
diff --git a/research/evolution/profiles.json b/research/evolution/profiles.json
index f56613d..7dcf782 100644
--- a/research/evolution/profiles.json
+++ b/research/evolution/profiles.json
@@ -359,7 +359,7 @@
"id": "CAND-0010",
"path": "research/candidates/ProgressiveEnhancement.md",
"title": "Progressive Enhancement",
- "sha256": "e9ca2b046cb69fff16379e22e1a9d0d61d2a5801ff92bbfc1b56ae3e3be16c7c",
+ "sha256": "ec3ab16d680308593af4d22fbbcbea737fe46096c5f3e65968d0db3a8befec21",
"status": "draft",
"maturity": "hypothesis",
"decision": "Keep essential actions usable when enhancement is unavailable.",
@@ -381,6 +381,12 @@
"family": "htmx in authored public-catalog fixture",
"ref": "research/reviews/NavigationHistoryExperiment.md",
"scope": "NH01–NH06: native/enhanced routes, history hit/miss, actual browser cache ordering and missing-Vary negative control; explicit Node validator checks separate."
+ },
+ {
+ "kind": "runtime",
+ "family": "htmx in authored public-catalog fixture",
+ "ref": "research/reviews/NavigationFocusExperiment.md",
+ "scope": "NF01–NF06: Tab/Enter navigation, raw versus authored focus/status policy, held-response ownership and background update; DOM evidence only, not AT speech."
}
],
"independent_full_contract_uses": null,
@@ -392,8 +398,8 @@
"last_substantive_review_date": "2026-09-27"
},
"gaps": [
- "Independent deployed full-contract recurrence remains unverified.",
- "Keyboard/focus/announcements, late-script activation, interrupted transport, invalid/deleted routes, offline availability and real intermediary behavior remain open."
+ "Independent deployed full-contract recurrence and human/AT validation remain unverified.",
+ "Focus visibility, delayed history, overlapping requests, late-script activation, interrupted transport, invalid/deleted routes, offline availability and real intermediaries remain open."
],
"superseded_by": []
},
@@ -560,7 +566,7 @@
"id": "CAND-0016",
"path": "research/candidates/FocusReturn.md",
"title": "Focus Return",
- "sha256": "b44f976684d7f2a9186e09aaa6fd6fdb51dc5674a53bcc90afa08748a641f041",
+ "sha256": "129ef7623d11da91f3f5429686455be16180e5477d1706836f5c1c3617698eae",
"status": "draft",
"maturity": "hypothesis",
"decision": "Restore meaningful focus after a temporary interaction ends.",
@@ -582,19 +588,26 @@
"family": "Radix",
"ref": "research/reviews/NestedOwnershipRouting.md",
"scope": "Authored fixture: raw 20/24 versus routed 24/24; browser/build limits retained."
+ },
+ {
+ "kind": "runtime",
+ "family": "htmx in authored public-catalog fixture",
+ "ref": "research/reviews/NavigationFocusExperiment.md",
+ "scope": "NF01–NF06: Tab/Enter navigation, raw versus authored focus/status policy, held-response ownership and background update; DOM evidence only, not AT speech."
}
],
"independent_full_contract_uses": null,
"review": {
- "assessed_at": "2026-09-26",
+ "assessed_at": "2026-09-27",
"reviewer": "Codex",
"role": "author-model",
"independent_human": false,
- "last_substantive_review_date": null
+ "last_substantive_review_date": "2026-09-27"
},
"gaps": [
"One implementation family; repeated trials are not independent uses.",
- "Animated exits and competing owners remain untested; no production repair claim."
+ "Animated exits and competing owners remain untested; no production repair claim.",
+ "Route continuation is a contrasting context, not independent modal-pattern recurrence; delayed history and AT speech unverified."
],
"superseded_by": []
},
diff --git a/research/experiments/navigation-history/README.md b/research/experiments/navigation-history/README.md
index 30274c9..ecd828d 100644
--- a/research/experiments/navigation-history/README.md
+++ b/research/experiments/navigation-history/README.md
@@ -38,3 +38,18 @@ History eviction uses htmx 2.0.11's sessionStorage key, an experimental control
to the pinned implementation. No assertion of identical content freshness across
history, general offline availability, accessibility, script-late races, writes,
real intermediary correctness or independent full-pattern recurrence follows.
+
+## Keyboard/focus follow-up
+
+[Preregistered LEARN-0012](../../evolution/cycles/2026-09-27-navigation-focus.md),
+[review](../../reviews/NavigationFocusExperiment.md), [receipt](focus-result.json).
+Run the same browser environment with `node focus.mjs`. Output defaults to
+`/tmp/fep-focus-result.json`; choose a fresh `FEP_RESULT_PATH` per execution.
+The separate focus runner/policy preserve the earlier navigation/cache inputs and
+receipt hashes. Same locked packages. 22 cases: native keyboard plus raw/managed
+navigation, 503 feedback, held-response focus ownership, history and background work.
+
+Raw rows observe behavior, so 22 passing rows do not mean raw and managed variants
+meet identical focus/feedback obligations. See NF01–NF06. The policy is authored
+experimental code; DOM focus and live-region text do not establish assistive-technology
+announcements or conformance. History and request-race limits remain explicit.
diff --git a/research/experiments/navigation-history/focus-policy.js b/research/experiments/navigation-history/focus-policy.js
new file mode 100644
index 0000000..f358b0a
--- /dev/null
+++ b/research/experiments/navigation-history/focus-policy.js
@@ -0,0 +1,32 @@
+// Authored experimental navigation policy; raw variant installs only diagnostics.
+window.probe=[];
+const managed=new URL(location.href).searchParams.get('mode')==='managed';
+const pending=new WeakMap();
+const notice=message=>{document.querySelector('#feedback').textContent=message;};
+function complete(moveFocus){
+ const heading=document.querySelector('#heading');
+ document.title=`${heading.textContent} — Catalog`;
+ notice(`Loaded ${heading.textContent}`);
+ if(moveFocus)heading.focus();
+}
+document.addEventListener('htmx:beforeRequest',e=>{
+ if(managed&&e.detail.target.id==='content')pending.set(e.detail.xhr,{source:e.detail.elt,ownsFocus:false});
+});
+document.addEventListener('htmx:beforeSwap',e=>{
+ const state=pending.get(e.detail.xhr);
+ if(state)state.ownsFocus=document.activeElement===state.source;
+});
+document.addEventListener('htmx:afterSwap',e=>{
+ const state=pending.get(e.detail.xhr);
+ if(state){complete(state.ownsFocus);pending.delete(e.detail.xhr);}
+});
+document.addEventListener('htmx:responseError',e=>{
+ if(managed&&pending.has(e.detail.xhr)){
+ notice('Navigation failed. Current article retained. Use Native recovery to continue.');
+ pending.delete(e.detail.xhr);
+ }
+});
+document.addEventListener('htmx:historyRestore',()=>{if(managed)complete(true);});
+for(const name of ['htmx:afterSettle','htmx:historyRestore','htmx:responseError']){
+ document.addEventListener(name,()=>window.probe.push({name,focus:document.activeElement.id||document.activeElement.tagName,title:document.title,url:location.href,feedback:document.querySelector('#feedback').textContent}));
+}
diff --git a/research/experiments/navigation-history/focus-result.json b/research/experiments/navigation-history/focus-result.json
new file mode 100644
index 0000000..28ebe12
--- /dev/null
+++ b/research/experiments/navigation-history/focus-result.json
@@ -0,0 +1,1354 @@
+{
+ "date": "2026-09-26T22:19:11.590Z",
+ "node": "v24.11.1",
+ "kind": "keyboard-focus-dom-observation-not-assistive-technology-validation",
+ "files": {
+ "focus.mjs": "74b0a2f15f761beadfb5945f0d5637493198711ea9f7332f47a37f75ac00cc4c",
+ "focus-policy.js": "cb91524d66cfff97b0bed905502479ab3134eecdfb6964a3b226d516476b145a",
+ "package.json": "373e05f4d2b9e043abc9391e6ec28bcf6ffdd5530e52f3e5db88ed20e4462ed5",
+ "package-lock.json": "6fb5a45148a199c10fd9b67b1d5468a0334e5fcc154f1f079fd88462a89328d3",
+ "node_modules/htmx.org/dist/htmx.js": "30612ca7e3d3baf407481f1798281c4481dcb93390a9722d328ce07290250426"
+ },
+ "browsers": {
+ "chromium": {
+ "version": "151.0.7922.34",
+ "executable": "/home/worsch/.cache/ms-playwright/chromium-1234/chrome-linux64/chrome",
+ "sha256": "0b20b130e7edd9dd51873be867761295fe0cfad490c2b9a64f95bd3cfc08fa71"
+ },
+ "firefox": {
+ "version": "155.0",
+ "executable": "/tmp/fep-playwright-browsers/firefox-1543/firefox/firefox",
+ "sha256": "062272ac4d851eade5b75db2dc7c14569d96cb3ca38f949337cdc1b74367e35b"
+ }
+ },
+ "results": [
+ {
+ "id": "K01-native-keyboard",
+ "engine": "chromium",
+ "mode": "native",
+ "status": "pass",
+ "observation": {
+ "keyboardLink": true
+ },
+ "final": {
+ "focus": "BODY",
+ "title": "beta — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=raw",
+ "heading": "beta",
+ "feedback": "",
+ "statusRole": "status",
+ "live": "polite"
+ },
+ "events": [],
+ "requests": [
+ {
+ "path": "/articles?topic=alpha&mode=native",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/favicon.ico",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/articles?topic=beta&mode=raw",
+ "hx": false,
+ "restore": false
+ }
+ ]
+ },
+ {
+ "id": "K02-enhanced-keyboard",
+ "engine": "chromium",
+ "mode": "raw",
+ "status": "pass",
+ "observation": {
+ "focus": "next",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=raw",
+ "heading": "beta",
+ "feedback": "",
+ "statusRole": "status",
+ "live": "polite",
+ "headingContinuation": false,
+ "updatedTitle": false,
+ "completionFeedback": false
+ },
+ "final": {
+ "focus": "next",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=raw",
+ "heading": "beta",
+ "feedback": "",
+ "statusRole": "status",
+ "live": "polite"
+ },
+ "events": [
+ {
+ "name": "htmx:afterSettle",
+ "focus": "next",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=raw",
+ "feedback": ""
+ }
+ ],
+ "requests": [
+ {
+ "path": "/articles?topic=alpha&mode=raw",
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+ {
+ "name": "htmx:afterSettle",
+ "focus": "search",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=alpha&mode=raw",
+ "feedback": ""
+ }
+ ],
+ "requests": [
+ {
+ "path": "/articles?topic=alpha&mode=raw",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/policy.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/htmx.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/favicon.ico",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/news",
+ "hx": true,
+ "restore": false
+ }
+ ]
+ },
+ {
+ "id": "K02-enhanced-keyboard",
+ "engine": "firefox",
+ "mode": "managed",
+ "status": "pass",
+ "observation": {
+ "focus": "heading",
+ "title": "beta — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=managed",
+ "heading": "beta",
+ "feedback": "Loaded beta",
+ "statusRole": "status",
+ "live": "polite",
+ "headingContinuation": true,
+ "updatedTitle": true,
+ "completionFeedback": true
+ },
+ "final": {
+ "focus": "heading",
+ "title": "beta — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=managed",
+ "heading": "beta",
+ "feedback": "Loaded beta",
+ "statusRole": "status",
+ "live": "polite"
+ },
+ "events": [
+ {
+ "name": "htmx:afterSettle",
+ "focus": "heading",
+ "title": "beta — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=managed",
+ "feedback": "Loaded beta"
+ }
+ ],
+ "requests": [
+ {
+ "path": "/articles?topic=alpha&mode=managed",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/policy.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/htmx.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/favicon.ico",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/articles?topic=beta&mode=managed",
+ "hx": true,
+ "restore": false
+ }
+ ]
+ },
+ {
+ "id": "K03-error-feedback-recovery",
+ "engine": "firefox",
+ "mode": "managed",
+ "status": "pass",
+ "observation": {
+ "focus": "broken",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=alpha&mode=managed",
+ "heading": "alpha",
+ "feedback": "Navigation failed. Current article retained. Use Native recovery to continue.",
+ "statusRole": "status",
+ "live": "polite",
+ "failureFeedback": true,
+ "nativeRecovery": true
+ },
+ "final": {
+ "focus": "BODY",
+ "title": "beta — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=managed&fail=1",
+ "heading": "beta",
+ "feedback": "",
+ "statusRole": "status",
+ "live": "polite"
+ },
+ "events": [],
+ "requests": [
+ {
+ "path": "/articles?topic=alpha&mode=managed",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/policy.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/htmx.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/favicon.ico",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/articles?topic=beta&mode=managed&fail=1",
+ "hx": true,
+ "restore": false
+ },
+ {
+ "path": "/articles?topic=beta&mode=managed&fail=1",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/policy.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/htmx.js",
+ "hx": false,
+ "restore": false
+ }
+ ]
+ },
+ {
+ "id": "K04-delayed-new-focus",
+ "engine": "firefox",
+ "mode": "managed",
+ "status": "pass",
+ "observation": {
+ "focus": "search",
+ "title": "beta — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=managed&slow=1",
+ "heading": "beta",
+ "feedback": "Loaded beta",
+ "statusRole": "status",
+ "live": "polite"
+ },
+ "final": {
+ "focus": "search",
+ "title": "beta — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=managed&slow=1",
+ "heading": "beta",
+ "feedback": "Loaded beta",
+ "statusRole": "status",
+ "live": "polite"
+ },
+ "events": [
+ {
+ "name": "htmx:afterSettle",
+ "focus": "search",
+ "title": "beta — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=managed&slow=1",
+ "feedback": "Loaded beta"
+ }
+ ],
+ "requests": [
+ {
+ "path": "/articles?topic=alpha&mode=managed",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/policy.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/htmx.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/favicon.ico",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/articles?topic=beta&mode=managed&slow=1",
+ "hx": true,
+ "restore": false
+ }
+ ]
+ },
+ {
+ "id": "K05-history-continuation",
+ "engine": "firefox",
+ "mode": "managed",
+ "status": "pass",
+ "observation": {
+ "focus": "heading",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=alpha&mode=managed",
+ "heading": "alpha",
+ "feedback": "Loaded alpha",
+ "statusRole": "status",
+ "live": "polite"
+ },
+ "final": {
+ "focus": "heading",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=alpha&mode=managed",
+ "heading": "alpha",
+ "feedback": "Loaded alpha",
+ "statusRole": "status",
+ "live": "polite"
+ },
+ "events": [
+ {
+ "name": "htmx:afterSettle",
+ "focus": "heading",
+ "title": "beta — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=beta&mode=managed",
+ "feedback": "Loaded beta"
+ },
+ {
+ "name": "htmx:afterSettle",
+ "focus": "heading",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=alpha&mode=managed",
+ "feedback": "Loaded beta"
+ },
+ {
+ "name": "htmx:historyRestore",
+ "focus": "heading",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=alpha&mode=managed",
+ "feedback": "Loaded alpha"
+ }
+ ],
+ "requests": [
+ {
+ "path": "/articles?topic=alpha&mode=managed",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/policy.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/htmx.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/favicon.ico",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/articles?topic=beta&mode=managed",
+ "hx": true,
+ "restore": false
+ }
+ ]
+ },
+ {
+ "id": "K06-background-no-theft",
+ "engine": "firefox",
+ "mode": "managed",
+ "status": "pass",
+ "observation": {
+ "focus": "search",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=alpha&mode=managed",
+ "heading": "alpha",
+ "feedback": "",
+ "statusRole": "status",
+ "live": "polite"
+ },
+ "final": {
+ "focus": "search",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=alpha&mode=managed",
+ "heading": "alpha",
+ "feedback": "",
+ "statusRole": "status",
+ "live": "polite"
+ },
+ "events": [
+ {
+ "name": "htmx:afterSettle",
+ "focus": "search",
+ "title": "alpha — Catalog",
+ "url": "http://127.0.0.1:41981/articles?topic=alpha&mode=managed",
+ "feedback": ""
+ }
+ ],
+ "requests": [
+ {
+ "path": "/articles?topic=alpha&mode=managed",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/policy.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/htmx.js",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/favicon.ico",
+ "hx": false,
+ "restore": false
+ },
+ {
+ "path": "/news",
+ "hx": true,
+ "restore": false
+ }
+ ]
+ }
+ ],
+ "passed": 22,
+ "total": 22
+}
diff --git a/research/experiments/navigation-history/focus.mjs b/research/experiments/navigation-history/focus.mjs
new file mode 100644
index 0000000..3e92c9c
--- /dev/null
+++ b/research/experiments/navigation-history/focus.mjs
@@ -0,0 +1,74 @@
+import {chromium,firefox} from 'playwright';
+import {createServer} from 'node:http';
+import {once} from 'node:events';
+import {readFile,writeFile} from 'node:fs/promises';
+import {createHash} from 'node:crypto';
+import assert from 'node:assert/strict';
+const dir=new URL('.',import.meta.url);
+const htmx=await readFile(new URL('node_modules/htmx.org/dist/htmx.js',dir));
+const policy=await readFile(new URL('focus-policy.js',dir));
+let requests=[],release=null,heldResolve=null;
+const server=createServer((req,res)=>{
+ const u=new URL(req.url,'http://local');res.setHeader('Cache-Control','no-store');
+ const hx=req.headers['hx-request']==='true';requests.push({path:req.url,hx,restore:req.headers['hx-history-restore-request']==='true'});
+ if(u.pathname==='/htmx.js'||u.pathname==='/policy.js'){res.setHeader('Content-Type','application/javascript');res.end(u.pathname==='/htmx.js'?htmx:policy);return;}
+ if(u.pathname==='/news'){res.end('Background news updated
');return;}
+ if(u.pathname!=='/articles'){res.writeHead(404);res.end('Not found');return;}
+ const topic=u.searchParams.get('topic')==='beta'?'beta':'alpha',mode=u.searchParams.get('mode')==='managed'?'managed':'raw';
+ const target=`/articles?topic=${topic==='alpha'?'beta':'alpha'}&mode=${mode}`;
+ const boost='hx-boost="true" hx-target="#content" hx-select="#content" hx-swap="outerHTML"';
+ const content=`${topic} Article ${topic}
Other topic Fail enhanced navigation Native recovery Delayed navigation ${topic} — Catalog Persistent search
`;
+ const send=()=>{res.writeHead(hx&&u.searchParams.has('fail')?503:200,{'Content-Type':'text/html'});res.end(hx&&u.searchParams.has('fail')?'Outage':body);};
+ if(hx&&u.searchParams.has('slow')){release=send;heldResolve?.();}else send();
+});
+server.listen(0,'127.0.0.1');await once(server,'listening');const base=`http://127.0.0.1:${server.address().port}`;
+const results=[],browsers={};const output=process.env.FEP_RESULT_PATH||'/tmp/fep-focus-result.json';
+async function inspect(p){return p.evaluate(()=>({focus:document.activeElement.id||document.activeElement.tagName,title:document.title,url:location.href,heading:document.querySelector('h1')?.textContent,feedback:document.querySelector('#feedback')?.textContent,statusRole:document.querySelector('#feedback')?.getAttribute('role'),live:document.querySelector('#feedback')?.getAttribute('aria-live')}));}
+async function tabTo(p,id){for(let i=0;i<12;i++){if((await inspect(p)).focus===id)return;await p.keyboard.press('Tab');}throw Error(`Tab failed to reach ${id}`);}
+async function selected(p,topic){await p.waitForFunction(t=>document.querySelector('h1')?.textContent===t,topic);assert.equal(new URL(p.url()).searchParams.get('topic'),topic);}
+async function settled(p){await p.waitForFunction(()=>window.probe.some(e=>e.name==='htmx:afterSettle'));}
+try{
+ for(const [engine,launcher]of [['chromium',chromium],['firefox',firefox]]){
+ const path=engine==='chromium'?process.env.FEP_CHROMIUM_PATH:undefined;
+ const browser=await launcher.launch({headless:true,...(path?{executablePath:path}:{})});
+ browsers[engine]={version:browser.version(),executable:path||launcher.executablePath(),sha256:createHash('sha256').update(await readFile(path||launcher.executablePath())).digest('hex')};
+ try{
+ async function scenario(id,mode,fn){
+ requests=[];release=null;const context=await browser.newContext({javaScriptEnabled:mode!=='native'});const p=await context.newPage();p.setDefaultTimeout(4000);
+ const r={id,engine,mode,status:'pass'};
+ try{await p.goto(base+`/articles?topic=alpha&mode=${mode}`);if(mode!=='native')await p.waitForFunction(()=>window.htmx?.version==='2.0.11');r.observation=await fn(p);}
+ catch(e){r.status='fail';r.error=e.message;}
+ r.final=await inspect(p).catch(()=>null);r.events=await p.evaluate(()=>window.probe||[]).catch(()=>[]);r.requests=[...requests];results.push(r);
+ if(release){release();release=null;}heldResolve=null;await context.close();await writeFile(output,JSON.stringify({status:'incomplete',results},null,2)+'\n');
+ }
+ await scenario('K01-native-keyboard','native',async p=>{await tabTo(p,'next');await p.keyboard.press('Enter');await selected(p,'beta');assert.equal(await p.title(),'beta — Catalog');return {keyboardLink:true};});
+ for(const mode of ['raw','managed']){
+ await scenario('K02-enhanced-keyboard',mode,async p=>{
+ await tabTo(p,'next');await p.keyboard.press('Enter');await selected(p,'beta');await settled(p);const o=await inspect(p);
+ o.headingContinuation=o.focus==='heading';o.updatedTitle=o.title==='beta — Catalog';o.completionFeedback=o.feedback==='Loaded beta';
+ if(mode==='managed')assert(o.headingContinuation&&o.updatedTitle&&o.completionFeedback);return o;
+ });
+ await scenario('K03-error-feedback-recovery',mode,async p=>{
+ await tabTo(p,'broken');await p.keyboard.press('Enter');await p.waitForFunction(()=>window.probe.some(e=>e.name==='htmx:responseError'));await selected(p,'alpha');const o=await inspect(p);assert.equal(o.focus,'broken');
+ o.failureFeedback=o.feedback.includes('Navigation failed');if(mode==='managed'){assert(o.failureFeedback);assert.equal(o.statusRole,'status');assert.equal(o.live,'polite');}
+ await tabTo(p,'recover');await p.keyboard.press('Enter');await selected(p,'beta');o.nativeRecovery=true;return o;
+ });
+ await scenario('K04-delayed-new-focus',mode,async p=>{
+ const held=new Promise(resolve=>{heldResolve=resolve;});await tabTo(p,'slow');await p.keyboard.press('Enter');await held;await tabTo(p,'search');
+ release();release=null;await selected(p,'beta');await settled(p);const o=await inspect(p);assert.equal(o.focus,'search');if(mode==='managed')assert.equal(o.feedback,'Loaded beta');return o;
+ });
+ await scenario('K05-history-continuation',mode,async p=>{
+ await tabTo(p,'next');await p.keyboard.press('Enter');await selected(p,'beta');await settled(p);await p.goBack();await selected(p,'alpha');await p.waitForFunction(()=>window.probe.some(e=>e.name==='htmx:historyRestore'));
+ const o=await inspect(p);if(mode==='managed'){assert.equal(o.focus,'heading');assert.equal(o.title,'alpha — Catalog');assert.equal(o.feedback,'Loaded alpha');}return o;
+ });
+ await scenario('K06-background-no-theft',mode,async p=>{
+ await tabTo(p,'search');await p.evaluate(()=>htmx.ajax('GET','/news',{target:'#news',swap:'innerHTML'}));await p.locator('#news').filter({hasText:'Background news updated'}).waitFor();
+ const o=await inspect(p);assert.equal(o.focus,'search');assert.equal(o.feedback,'');assert.equal(o.title,'alpha — Catalog');return o;
+ });
+ }
+ }finally{await browser.close();}
+ }
+}finally{if(release)release();await new Promise(resolve=>server.close(resolve));}
+const files={};for(const f of ['focus.mjs','focus-policy.js','package.json','package-lock.json','node_modules/htmx.org/dist/htmx.js'])files[f]=createHash('sha256').update(await readFile(new URL(f,dir))).digest('hex');
+const r={date:new Date().toISOString(),node:process.version,kind:'keyboard-focus-dom-observation-not-assistive-technology-validation',files,browsers,results,passed:results.filter(x=>x.status==='pass').length,total:results.length};await writeFile(output,JSON.stringify(r,null,2)+'\n');console.log(JSON.stringify({output,passed:r.passed,total:r.total,failures:results.filter(x=>x.status==='fail')},null,2));if(r.passed!==r.total)process.exitCode=1;
diff --git a/research/reviews/NavigationCoverage.md b/research/reviews/NavigationCoverage.md
index 8980f6a..ebf7106 100644
--- a/research/reviews/NavigationCoverage.md
+++ b/research/reviews/NavigationCoverage.md
@@ -33,3 +33,10 @@ corroboration to VC-03, URL-addressable State and Progressive Enhancement. Direc
native/enhanced/history and representation-cache subset exercised in two browsers;
missing-Vary negative control reproduced. VC-03 stays provisional and offline/
accessibility work remains open. No maturity or M1/M2 promotion.
+
+## Keyboard continuation evidence — 2026-09-27
+
+[NF01–NF06](NavigationFocusExperiment.md) adds 22 native/raw/managed observations to
+the provisional VC-03 subset. Explicit focus/title/status policy and delayed-response
+ownership exercised; AT speech and full accessibility validation remain pending.
+This is a new stream-F comparison group, not another comparable cache cycle.
diff --git a/research/reviews/NavigationFocusExperiment.md b/research/reviews/NavigationFocusExperiment.md
new file mode 100644
index 0000000..20fc902
--- /dev/null
+++ b/research/reviews/NavigationFocusExperiment.md
@@ -0,0 +1,85 @@
+# Keyboard continuation and navigation feedback — 2026-09-27
+
+LEARN-0012; Codex author-model review. [Preregistered protocol](../evolution/cycles/2026-09-27-navigation-focus.md)
+committed as `2b1c9a4` before implementation/execution. New stream-F comparison group
+F-navigation-focus-v1, not comparable to the preceding HTTP/cache question's group.
+[Runner](../experiments/navigation-history/focus.mjs),
+[authored policy](../experiments/navigation-history/focus-policy.js),
+[receipt](../experiments/navigation-history/focus-result.json).
+
+## Evidence and result
+
+Pinned htmx 2.0.11, Playwright 1.63.0; same binary versions/hashes as the previous
+navigation cycle: Chromium 151.0.7922.34 and Firefox 155.0. One run, no harness
+corrections or discarded failures. 22/22 registered rows completed: two native cases,
+ten raw observation cases, ten managed-policy cases. A passing raw observation row
+means it was recorded successfully, not that it satisfies the managed obligations.
+All browser actions initiating navigation use Tab/Enter; background update is
+explicitly script-triggered and browser history uses Playwright's history command.
+
+| Claim | Cases | Observations in both browsers |
+| --- | --- | --- |
+| NF01 | K01 | With scripts disabled, Tab reaches the native link and Enter loads beta with its full-document title |
+| NF02 | K02 | Raw htmx retains focus on the new same-ID `next` link, but this fragment response leaves alpha's title over beta content and produces no completion status. Managed policy focuses beta's heading, updates title and writes `Loaded beta` |
+| NF03 | K03 | Enhanced 503 preserves alpha URL/content and the invoking link's focus in both variants. Only managed policy writes the failure/recovery message; native recovery works by keyboard in both |
+| NF04 | K04 | While a response is held at the server, the user tabs to persistent search. Both variants preserve search focus on release; managed policy reports completion without moving focus |
+| NF05 | K05 | History restores alpha. Raw focus is the same-ID link; managed focus is the heading with matching title/status |
+| NF06 | K06 | An unrelated background region update preserves search focus and does not emit navigation feedback in either variant |
+
+The raw result narrows our anticipation of focus loss: stable IDs let htmx restore
+focus to a replacement element. Here that link now leads back to the other article.
+DOM identity retention alone is not proof of an appropriate next task, but neither is
+this observation proof that retaining the link is always wrong. The server deliberately
+returns a fragment without title metadata; this is an application contract gap, not
+a claim that htmx cannot update document titles.
+
+## Mechanism and interpretation
+
+The authored policy remembers the request source, checks focus ownership immediately
+before a zero-delay swap, and applies the continuation synchronously on afterSwap,
+after the library's own focus restoration. It updates heading/title/status only for
+registered content navigation. It leaves a surviving search control alone if focus
+has moved there. Errors keep focus on the invoker and provide a visible polite status
+message with a native recovery action already present. History uses a separate explicit
+heading policy. It is a small experiment, not a production navigation library.
+
+[W3C focus-order guidance](https://www.w3.org/WAI/WCAG22/Understanding/focus-order.html)
+allows more than one meaningful focus order and does not prescribe one universal target.
+[Status-message guidance](https://www.w3.org/WAI/WCAG22/Understanding/status-messages.html)
+informs making feedback programmatically available without requiring focus movement.
+[htmx events](https://htmx.org/events/) supplies the lifecycle hooks. Living primary
+pages accessed 2026-09-27; exact documentation revisions unknown. Package implementation
+is pinned and hashed. DOM status/ARIA observations are not evidence that a screen reader
+spoke the message; no assistive technology or human evaluation was run.
+
+## Disposition and limits
+
+**Corroboration**, one bounded outcome. Existing Progressive Enhancement already calls
+for focus, feedback and recovery semantics; Focus Return explicitly excludes automatic
+generalization from modal closure to route transitions. The experiment makes that
+boundary concrete and adds an ownership-sensitive candidate mechanism. No newly
+invented pattern, canonical promotion, independent recurrence or usefulness gain.
+
+Add scoped implementation guidance: distinguish successful route continuation, failed
+navigation, history and background updates. Test whether a late response still owns
+focus before moving it. Returning to a modal invoker and continuing into a new page
+are different decisions. Keep both candidates as hypotheses.
+
+Unverified: screen-reader speech (including possible heading/status duplication),
+focus visibility, complete names/order audit, actual usability, pointer modality,
+nonzero swap delays, overlapping/superseded route requests, delayed history responses
+while the user moves focus, script-late activation, interrupted transport and offline
+availability. The explicit history policy always focuses a heading in the tested
+immediate restore; it is not proven safe for an asynchronous history miss. Public
+single-response success does not settle these ownership races. No writes or production
+application were exercised.
+
+[Effort receipt](../evolution/cycles/2026-09-27-navigation-focus-effort.json) separates
+monotonic active agent time from experiment/check subprocess time; final administrative
+refresh/commit/snapshot/sync overhead excluded. No token/cost estimate. One cycle in
+this new comparison group cannot establish a trend, even though the ledger now has
+two prospective cycles in different groups.
+
+WP-0003 T01 retains delayed history restoration/overlapping navigation ownership and
+interrupted enhancement. WP-0003 T02 retains independent human/AT validation and the
+offline branch. WP-0006 T03 retains comparable-window and remaining review-date work.
diff --git a/research/walkthroughs/VC03-ContentPublication.md b/research/walkthroughs/VC03-ContentPublication.md
index bd274a2..5669bb7 100644
--- a/research/walkthroughs/VC03-ContentPublication.md
+++ b/research/walkthroughs/VC03-ContentPublication.md
@@ -108,3 +108,12 @@ loss under missing Vary. Validator checks use explicit Node requests. This stren
the read-only trace; the case remains provisional. Keyboard/focus/announcements, late
scripts, interrupted transport, invalid/deleted routes and the offline branch remain
open. No performance, independent-human or decision-usefulness gate is completed.
+
+## Keyboard/feedback subset — 2026-09-27
+
+[NF01–NF06](../reviews/NavigationFocusExperiment.md) exercises keyboard links, request
+failure/recovery, explicit route continuation and a held response after focus moves
+to persistent search. The managed policy passes its DOM obligations; raw same-ID
+focus retention does not itself update title or report errors in this fragment host.
+VC-03 stays provisional. Spoken feedback, focus visibility, delayed history/request
+races and offline availability remain open; no complete accessibility claim.
diff --git a/workplans/FEP-WP-0003-contrasting-schools.md b/workplans/FEP-WP-0003-contrasting-schools.md
index d10f851..473c976 100644
--- a/workplans/FEP-WP-0003-contrasting-schools.md
+++ b/workplans/FEP-WP-0003-contrasting-schools.md
@@ -201,3 +201,17 @@ WP-0006 T03 remains progress for comparable-window review and remaining substant
review-date reconciliation. Choose a new comparison group for materially different
questions. M1/M2 and independent-human validation remain open. See
research/reviews/NavigationHistoryExperiment.md.
+
+## Measured keyboard/focus cycle — 2026-09-27
+
+LEARN-0012 registered at 2b1c9a4 in new comparison group F-navigation-focus-v1.
+22/22 native/raw/managed rows complete; raw rows are observations, not fulfillment
+of managed obligations. Same-ID focus retained by raw htmx, while authored policy
+adds heading/title/status continuation and preserves newer search focus. Outcome
+corroboration, hypotheses retained; no AT or human validation, no trend across the
+two different prospective groups. See research/reviews/NavigationFocusExperiment.md.
+
+WP-0003 T01 next: delayed history restoration and competing-navigation ownership;
+interrupted/late enhancement remains open. T02 retains AT/independent review and
+offline branch. WP-0006 T03 remains progress for comparable windows and remaining
+review-date reconciliation. No M1/M2 completion.
diff --git a/workplans/FEP-WP-0006-language-evolution.md b/workplans/FEP-WP-0006-language-evolution.md
index 038a60c..924bdb7 100644
--- a/workplans/FEP-WP-0006-language-evolution.md
+++ b/workplans/FEP-WP-0006-language-evolution.md
@@ -80,3 +80,17 @@ WP-0006 T03 remains progress for comparable-window review and remaining substant
review-date reconciliation. Choose a new comparison group for materially different
questions. M1/M2 and independent-human validation remain open. See
research/reviews/NavigationHistoryExperiment.md.
+
+## Measured keyboard/focus cycle — 2026-09-27
+
+LEARN-0012 registered at 2b1c9a4 in new comparison group F-navigation-focus-v1.
+22/22 native/raw/managed rows complete; raw rows are observations, not fulfillment
+of managed obligations. Same-ID focus retained by raw htmx, while authored policy
+adds heading/title/status continuation and preserves newer search focus. Outcome
+corroboration, hypotheses retained; no AT or human validation, no trend across the
+two different prospective groups. See research/reviews/NavigationFocusExperiment.md.
+
+WP-0003 T01 next: delayed history restoration and competing-navigation ownership;
+interrupted/late enhancement remains open. T02 retains AT/independent review and
+offline branch. WP-0006 T03 remains progress for comparable windows and remaining
+review-date reconciliation. No M1/M2 completion.