diff --git a/shared/static/scripts/sx-browser.js b/shared/static/scripts/sx-browser.js
index 5d45290..b0da85b 100644
--- a/shared/static/scripts/sx-browser.js
+++ b/shared/static/scripts/sx-browser.js
@@ -14,7 +14,7 @@
   // =========================================================================
 
   var NIL = Object.freeze({ _nil: true, toString: function() { return "nil"; } });
-  var SX_VERSION = "2026-03-13T02:54:01Z";
+  var SX_VERSION = "2026-03-13T03:23:01Z";
 
   function isNil(x) { return x === NIL || x === null || x === undefined; }
   function isSxTruthy(x) { return x !== false && !isNil(x); }
@@ -1898,7 +1898,10 @@ return (function() { var _m = typeOf(expr); if (_m == "nil") return createFragme
 })() : renderToDom(trampoline(evalExpr(expr, env)), env, ns))))))))))))));
 })() : (isSxTruthy(sxOr(isLambda(head), (typeOf(head) == "list"))) ? renderToDom(trampoline(evalExpr(expr, env)), env, ns) : (function() {
   var frag = createFragment();
-  { var _c = expr; for (var _i = 0; _i < _c.length; _i++) { var x = _c[_i]; domAppend(frag, renderToDom(x, env, ns)); } }
+  { var _c = expr; for (var _i = 0; _i < _c.length; _i++) { var x = _c[_i]; (function() {
+  var result = renderToDom(x, env, ns);
+  return (isSxTruthy(!isSxTruthy(isSpread(result))) ? domAppend(frag, result) : NIL);
+})(); } }
   return frag;
 })()));
 })(); };
@@ -1964,7 +1967,10 @@ return (function() { var _m = typeOf(expr); if (_m == "nil") return createFragme
   if (isSxTruthy(componentHasChildren(comp))) {
   (function() {
   var childFrag = createFragment();
-  { var _c = children; for (var _i = 0; _i < _c.length; _i++) { var c = _c[_i]; domAppend(childFrag, renderToDom(c, env, ns)); } }
+  { var _c = children; for (var _i = 0; _i < _c.length; _i++) { var c = _c[_i]; (function() {
+  var result = renderToDom(c, env, ns);
+  return (isSxTruthy(!isSxTruthy(isSpread(result))) ? domAppend(childFrag, result) : NIL);
+})(); } }
   return envSet(local, "children", childFrag);
 })();
 }
@@ -1975,7 +1981,10 @@ return (function() { var _m = typeOf(expr); if (_m == "nil") return createFragme
   // render-dom-fragment
   var renderDomFragment = function(args, env, ns) { return (function() {
   var frag = createFragment();
-  { var _c = args; for (var _i = 0; _i < _c.length; _i++) { var x = _c[_i]; domAppend(frag, renderToDom(x, env, ns)); } }
+  { var _c = args; for (var _i = 0; _i < _c.length; _i++) { var x = _c[_i]; (function() {
+  var result = renderToDom(x, env, ns);
+  return (isSxTruthy(!isSxTruthy(isSpread(result))) ? domAppend(frag, result) : NIL);
+})(); } }
   return frag;
 })(); };
 
@@ -2078,14 +2087,22 @@ return (function() { var _m = typeOf(expr); if (_m == "nil") return createFragme
   return (isSxTruthy(branch) ? renderToDom(branch, env, ns) : createFragment());
 })()) : (isSxTruthy((name == "case")) ? renderToDom(trampoline(evalExpr(expr, env)), env, ns) : (isSxTruthy(sxOr((name == "let"), (name == "let*"))) ? (function() {
   var local = processBindings(nth(expr, 1), env);
+  return (isSxTruthy((len(expr) == 3)) ? renderToDom(nth(expr, 2), local, ns) : (function() {
   var frag = createFragment();
-  { var _c = range(2, len(expr)); for (var _i = 0; _i < _c.length; _i++) { var i = _c[_i]; domAppend(frag, renderToDom(nth(expr, i), local, ns)); } }
+  { var _c = range(2, len(expr)); for (var _i = 0; _i < _c.length; _i++) { var i = _c[_i]; (function() {
+  var result = renderToDom(nth(expr, i), local, ns);
+  return (isSxTruthy(!isSxTruthy(isSpread(result))) ? domAppend(frag, result) : NIL);
+})(); } }
   return frag;
-})() : (isSxTruthy(sxOr((name == "begin"), (name == "do"))) ? (function() {
+})());
+})() : (isSxTruthy(sxOr((name == "begin"), (name == "do"))) ? (isSxTruthy((len(expr) == 2)) ? renderToDom(nth(expr, 1), env, ns) : (function() {
   var frag = createFragment();
-  { var _c = range(1, len(expr)); for (var _i = 0; _i < _c.length; _i++) { var i = _c[_i]; domAppend(frag, renderToDom(nth(expr, i), env, ns)); } }
+  { var _c = range(1, len(expr)); for (var _i = 0; _i < _c.length; _i++) { var i = _c[_i]; (function() {
+  var result = renderToDom(nth(expr, i), env, ns);
+  return (isSxTruthy(!isSxTruthy(isSpread(result))) ? domAppend(frag, result) : NIL);
+})(); } }
   return frag;
-})() : (isSxTruthy(isDefinitionForm(name)) ? (trampoline(evalExpr(expr, env)), createFragment()) : (isSxTruthy((name == "map")) ? (function() {
+})()) : (isSxTruthy(isDefinitionForm(name)) ? (trampoline(evalExpr(expr, env)), createFragment()) : (isSxTruthy((name == "map")) ? (function() {
   var collExpr = nth(expr, 2);
   return (isSxTruthy((isSxTruthy(_islandScope) && isSxTruthy((typeOf(collExpr) == "list")) && isSxTruthy((len(collExpr) > 1)) && isSxTruthy((typeOf(first(collExpr)) == "symbol")) && (symbolName(first(collExpr)) == "deref"))) ? (function() {
   var f = trampoline(evalExpr(nth(expr, 1), env));
diff --git a/shared/sx/ref/adapter-dom.sx b/shared/sx/ref/adapter-dom.sx
index 5c956a8..7c17907 100644
--- a/shared/sx/ref/adapter-dom.sx
+++ b/shared/sx/ref/adapter-dom.sx
@@ -160,7 +160,11 @@
         ;; Data list
         :else
           (let ((frag (create-fragment)))
-            (for-each (fn (x) (dom-append frag (render-to-dom x env ns))) expr)
+            (for-each (fn (x)
+              (let ((result (render-to-dom x env ns)))
+                (when (not (spread? result))
+                  (dom-append frag result))))
+              expr)
             frag)))))
 
 
@@ -296,10 +300,14 @@
           (component-params comp))
 
         ;; If component accepts children, pre-render them to a fragment
+        ;; Spread values are filtered out (no parent element to merge onto)
         (when (component-has-children? comp)
           (let ((child-frag (create-fragment)))
             (for-each
-              (fn (c) (dom-append child-frag (render-to-dom c env ns)))
+              (fn (c)
+                (let ((result (render-to-dom c env ns)))
+                  (when (not (spread? result))
+                    (dom-append child-frag result))))
               children)
             (env-set! local "children" child-frag)))
 
@@ -314,7 +322,10 @@
   (fn ((args :as list) (env :as dict) (ns :as string))
     (let ((frag (create-fragment)))
       (for-each
-        (fn (x) (dom-append frag (render-to-dom x env ns)))
+        (fn (x)
+          (let ((result (render-to-dom x env ns)))
+            (when (not (spread? result))
+              (dom-append frag result))))
         args)
       frag)))
 
@@ -498,24 +509,32 @@
       (= name "case")
         (render-to-dom (trampoline (eval-expr expr env)) env ns)
 
-      ;; let / let*
+      ;; let / let* — single body: pass through (spread propagates). Multi: fragment.
       (or (= name "let") (= name "let*"))
-        (let ((local (process-bindings (nth expr 1) env))
-              (frag (create-fragment)))
-          (for-each
-            (fn (i)
-              (dom-append frag (render-to-dom (nth expr i) local ns)))
-            (range 2 (len expr)))
-          frag)
+        (let ((local (process-bindings (nth expr 1) env)))
+          (if (= (len expr) 3)
+            (render-to-dom (nth expr 2) local ns)
+            (let ((frag (create-fragment)))
+              (for-each
+                (fn (i)
+                  (let ((result (render-to-dom (nth expr i) local ns)))
+                    (when (not (spread? result))
+                      (dom-append frag result))))
+                (range 2 (len expr)))
+              frag)))
 
-      ;; begin / do
+      ;; begin / do — single body: pass through. Multi: fragment.
       (or (= name "begin") (= name "do"))
-        (let ((frag (create-fragment)))
-          (for-each
-            (fn (i)
-              (dom-append frag (render-to-dom (nth expr i) env ns)))
-            (range 1 (len expr)))
-          frag)
+        (if (= (len expr) 2)
+          (render-to-dom (nth expr 1) env ns)
+          (let ((frag (create-fragment)))
+            (for-each
+              (fn (i)
+                (let ((result (render-to-dom (nth expr i) env ns)))
+                  (when (not (spread? result))
+                    (dom-append frag result))))
+              (range 1 (len expr)))
+            frag))
 
       ;; Definition forms — eval for side effects
       (definition-form? name)