Lazy readiness, $global fills, controllables, and client-owned child inputs

.sizes.json

@@ -7,8 +7,8 @@
     {
       "name": "*",
       "total": {
-        "min": 28306,
-        "brotli": 10486
+        "min": 28323,
+        "brotli": 10466
       }
     },
     {

.sizes/dom.js

@@ -1,4 +1,4 @@
-// size: 28306 (min) 10486 (brotli)
+// size: 28323 (min) 10466 (brotli)
 //#region packages/runtime-tags/dist/dom.mjs
 let unsafeStyleAttrReg = /[\\;]/g,
   replaceUnsafeStyleAttr = (c) => (c === ";" ? "\\3B " : "\\\\"),
@@ -97,11 +97,8 @@ let unsafeStyleAttrReg = /[\\;]/g,
   registeredValues = {},
   patchers = {},
   onPatchRecord,
-  failPatch = () => {
-    throw 0;
-  },
   patchScope = (partial, live) => {
-    for (let key in partial) (patchers[key[0]] || failPatch())(live, key, partial[key]);
+    for (let key in partial) patchers[key[0]](live, key, partial[key]);
   },
   curRenders,
   embedRenders,
@@ -979,7 +976,7 @@ function walk(startNode, walkCodes, branch) {
 }
 function beginPatch(renderId) {
   let render = (patchRender = curRenders[renderId]);
-  return ((patching = 1), patchId++, render);
+  return (render.w(), (patching = 1), patchId++, render);
 }
 function abortPatch() {
   patchRender = patching = 0;
@@ -2268,14 +2265,14 @@ let empty = [],
                     insertLoaded(renderer, branch, branch.S, awaitCounter),
                   ));
               },
-              loadFailed(branch, awaitCounter),
+              loadFailed(branch, awaitCounter, "_" + id),
             ));
         },
         _load_signal(() => (pending ||= load()).then((r) => ({ _: r.d }))),
       );
     return lazyTemplate;
   }),
-  _load_setup = /*@__PURE__*/ withLazy((nodeAccessor, childScopeAccessor, load) => {
+  _load_setup = /*@__PURE__*/ withLazy((nodeAccessor, childScopeAccessor, load, readyId) => {
     ((nodeAccessor = decodeAccessor(nodeAccessor)),
       (childScopeAccessor = decodeAccessor(childScopeAccessor)));
     let pending, renderer;
@@ -2289,10 +2286,10 @@ let empty = [],
             (mod) => {
               ((renderer = _content("", ...mod._)()),
                 queueAsyncRender(child, (child) =>
-                  insertLoaded(renderer, child, owner[nodeAccessor], awaitCounter),
+                  insertLoaded(renderer, child, owner[nodeAccessor], awaitCounter, readyId),
                 ));
             },
-            loadFailed(child, awaitCounter),
+            loadFailed(child, awaitCounter, readyId),
           ));
       }
     };
@@ -2386,11 +2383,14 @@ function mount(input = {}, reference, position) {
     }
   );
 }
-function insertLoaded(renderer, branch, marker, awaitCounter) {
+function insertLoaded(renderer, branch, marker, awaitCounter, readyId) {
   let parent = marker.parentNode,
     values = branch.X,
     insert = () => {
-      (insertBranchBefore(branch, parent, marker), marker.remove(), awaitCounter?.c());
+      (insertBranchBefore(branch, parent, marker),
+        marker.remove(),
+        awaitCounter?.c(),
+        readyId && queueEffect(branch, () => ready(readyId)));
     },
     remaining;
   if (
@@ -2399,7 +2399,7 @@ function insertLoaded(renderer, branch, marker, awaitCounter) {
     (branch.X = 0),
     (remaining = values?.size))
   ) {
-    let fail = loadFailed(branch, awaitCounter);
+    let fail = loadFailed(branch, awaitCounter, readyId);
     for (let [promise, entry] of values)
       promise.then(
         (signal) => {
@@ -2416,7 +2416,7 @@ function insertLoaded(renderer, branch, marker, awaitCounter) {
       );
   } else (setupBranch(renderer, branch), insert());
 }
-function loadFailed(scope, awaitCounter) {
+function loadFailed(scope, awaitCounter, readyId) {
   return (error) => {
     (awaitCounter && (awaitCounter.m ? (awaitCounter.i = 0) : awaitCounter.c()),
       queueAsyncRender(scope, renderCatch, error));

agent-feedback/items/2026-08-21-backport-lazy-load-failure-reporting-to-main.md

@@ -0,0 +1,20 @@
+---
+type: cleanup
+impact: med
+effort: med
+site: packages/runtime-tags/src/translator/visitors/program/index.ts › isLoadEntry
+---
+
+Lazy load failure reporting (`readyFailed` in `src/dom/resume.ts`, the load
+entry's rejection arm, and the loader-script `onerror` wiring in
+`src/html/assets.ts` › `writeTriggerScript`) is gated on `isPersisted()`
+because persisted patches need it to settle. The gap it closes is general:
+on ANY page a failed lazy chunk currently leaves inert SSR content silently
+(no `@catch`, no signal). Backporting the protocol to main — un-gating the
+rejection arm and onerror wiring, and driving the ready-channel branches'
+`@catch`/await-counter machinery from `readyFailed` — would give lazy SSR a
+real failure story and dissolve the persisted-only gates here.
+
+Check: non-persisted fixture with `load: "on-click body"` +
+`reject_load: ["load.mjs"]` — the child stays inert with no catch UI and no
+console signal.

agent-feedback/items/2026-08-23-pair-patches-into-still-streaming-boundaries.md

@@ -0,0 +1,18 @@
+---
+type: feature
+impact: med
+effort: high
+site: packages/runtime-tags/src/dom/patch-boundary.feat.ts › PatchKey.Pending
+---
+
+# Pair patches into still-streaming boundaries
+
+A patch arriving while a boundary's initial stream is still pending rejects
+into navigation (safe: the construct's marker anchor has not streamed —
+pinned by `persisted-await-patch-while-pending`). Supporting it needs the
+frame to defer against the initial render's own reorder machinery (apply
+once the anchor lands, or supersede the pending chunk outright) rather
+than pairing against a node that does not exist yet.
+
+Check: `persisted-await-patch-while-pending` drops `expect_rejection` and
+shows the second update applying once mid-stream pairing lands.

packages/runtime-tags/src/__tests__/fixtures/lazy-tag-conditional-child-inert/sizes.json

@@ -5,8 +5,8 @@
       "brotli": 90
     },
     "template.marko.page.mjs": {
-      "min": 1470,
-      "brotli": 802
+      "min": 1524,
+      "brotli": 831
     },
     "child.mjs": {
       "min": 162,
@@ -17,8 +17,8 @@
       "brotli": 80
     },
     "shared": {
-      "min": 7449,
-      "brotli": 3339
+      "min": 7456,
+      "brotli": 3337
     }
   },
   "html": {

packages/runtime-tags/src/__tests__/fixtures/lazy-tag-conditional-child-state/sizes.json

@@ -5,8 +5,8 @@
       "brotli": 69
     },
     "template.marko.page.mjs": {
-      "min": 1474,
-      "brotli": 799
+      "min": 1528,
+      "brotli": 814
     },
     "child.mjs": {
       "min": 297,
@@ -17,8 +17,8 @@
       "brotli": 81
     },
     "shared": {
-      "min": 7471,
-      "brotli": 3342
+      "min": 7478,
+      "brotli": 3340
     }
   },
   "html": {

packages/runtime-tags/src/__tests__/fixtures/lazy-tag-dynamic-placeholder/sizes.json

@@ -5,16 +5,16 @@
       "brotli": 69
     },
     "template.marko.page.mjs": {
-      "min": 1524,
-      "brotli": 820
+      "min": 1556,
+      "brotli": 848
     },
     "child.mjs": {
       "min": 212,
       "brotli": 143
     },
     "shared": {
-      "min": 11182,
-      "brotli": 4825
+      "min": 11189,
+      "brotli": 4818
     }
   },
   "html": {

packages/runtime-tags/src/__tests__/fixtures/lazy-tag-dynamic-unmount-before-load/sizes.json

@@ -5,16 +5,16 @@
       "brotli": 69
     },
     "template.marko.page.mjs": {
-      "min": 1464,
-      "brotli": 800
+      "min": 1513,
+      "brotli": 824
     },
     "child.mjs": {
       "min": 223,
       "brotli": 161
     },
     "shared": {
-      "min": 11058,
-      "brotli": 4761
+      "min": 11065,
+      "brotli": 4760
     }
   },
   "html": {

packages/runtime-tags/src/__tests__/fixtures/lazy-tag-dynamic/sizes.json

@@ -5,16 +5,16 @@
       "brotli": 69
     },
     "template.marko.page.mjs": {
-      "min": 1405,
-      "brotli": 764
+      "min": 1446,
+      "brotli": 783
     },
     "child.mjs": {
       "min": 212,
       "brotli": 143
     },
     "shared": {
-      "min": 10831,
-      "brotli": 4684
+      "min": 10838,
+      "brotli": 4685
     }
   },
   "html": {

packages/runtime-tags/src/__tests__/fixtures/lazy-tag-event-unmount-before-load/sizes.json

@@ -5,8 +5,8 @@
       "brotli": 69
     },
     "template.marko.page.mjs": {
-      "min": 1641,
-      "brotli": 874
+      "min": 1695,
+      "brotli": 890
     },
     "child.mjs": {
       "min": 177,
@@ -17,8 +17,8 @@
       "brotli": 75
     },
     "shared": {
-      "min": 7413,
-      "brotli": 3289
+      "min": 7420,
+      "brotli": 3287
     }
   },
   "html": {

packages/runtime-tags/src/__tests__/fixtures/lazy-tag-idle-unmount-before-load/sizes.json

@@ -5,8 +5,8 @@
       "brotli": 69
     },
     "template.marko.page.mjs": {
-      "min": 1578,
-      "brotli": 864
+      "min": 1632,
+      "brotli": 872
     },
     "child.mjs": {
       "min": 177,
@@ -17,8 +17,8 @@
       "brotli": 75
     },
     "shared": {
-      "min": 7413,
-      "brotli": 3289
+      "min": 7420,
+      "brotli": 3287
     }
   },
   "html": {

packages/runtime-tags/src/__tests__/fixtures/lazy-tag-input-chunk-load-error/sizes.json

@@ -5,8 +5,8 @@
       "brotli": 90
     },
     "template.marko.page.mjs": {
-      "min": 1575,
-      "brotli": 867
+      "min": 1629,
+      "brotli": 883
     },
     "child.mjs": {
       "min": 124,
@@ -17,8 +17,8 @@
       "brotli": 69
     },
     "shared": {
-      "min": 7842,
-      "brotli": 3466
+      "min": 7849,
+      "brotli": 3469
     }
   },
   "html": {

packages/runtime-tags/src/__tests__/fixtures/lazy-tag-load-error/sizes.json

@@ -5,8 +5,8 @@
       "brotli": 69
     },
     "template.marko.page.mjs": {
-      "min": 1575,
-      "brotli": 867
+      "min": 1629,
+      "brotli": 883
     },
     "child.mjs": {
       "min": 145,
@@ -17,8 +17,8 @@
       "brotli": 75
     },
     "shared": {
-      "min": 7853,
-      "brotli": 3467
+      "min": 7860,
+      "brotli": 3470
     }
   },
   "html": {

packages/runtime-tags/src/__tests__/fixtures/lazy-tag-mixed-known-and-dynamic/sizes.json

@@ -5,16 +5,16 @@
       "brotli": 69
     },
     "template.marko.page.mjs": {
-      "min": 1475,
-      "brotli": 792
+      "min": 1516,
+      "brotli": 806
     },
     "child.mjs": {
       "min": 190,
       "brotli": 132
     },
     "shared": {
-      "min": 10889,
-      "brotli": 4736
+      "min": 10896,
+      "brotli": 4737
     }
   },
   "html": {