Add DOM primitives (dom-set-prop, dom-call-method, dom-post-message), bump SW cache v2, remove video demo

New platform_js primitives for direct DOM property/method access and
cross-origin iframe communication. Service worker static cache bumped
to v2 to flush stale assets. Removed experimental video embed from
header island, routes, and home page.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/static/scripts/sx-browser.js

@@ -14,7 +14,7 @@
   // =========================================================================
 
   var NIL = Object.freeze({ _nil: true, toString: function() { return "nil"; } });
-  var SX_VERSION = "2026-03-11T21:02:07Z";
+  var SX_VERSION = "2026-03-11T21:11:04Z";
 
   function isNil(x) { return x === NIL || x === null || x === undefined; }
   function isSxTruthy(x) { return x !== false && !isNil(x); }
@@ -3999,12 +3999,20 @@ return (isSxTruthy((_batchDepth == 0)) ? (function() {
   function domCallMethod() {
     var obj = arguments[0], method = arguments[1];
     var args = Array.prototype.slice.call(arguments, 2);
-    console.log("[sx] dom-call-method:", obj, method, args);
     if (obj && typeof obj[method] === 'function') {
       try { return obj[method].apply(obj, args); }
       catch(e) { console.error("[sx] dom-call-method error:", e); return NIL; }
     }
-    console.warn("[sx] dom-call-method: method not found or obj null", obj, method);
+    return NIL;
+  }
+  // Post a message to an iframe's contentWindow without exposing the cross-origin
+  // Window object to the SX evaluator (which would trigger _thunk access errors).
+  function domPostMessage(iframe, msg, origin) {
+    try {
+      if (iframe && iframe.contentWindow) {
+        iframe.contentWindow.postMessage(msg, origin || '*');
+      }
+    } catch(e) { console.error("[sx] domPostMessage error:", e); }
     return NIL;
   }
 
@@ -5213,6 +5221,7 @@ return (isSxTruthy((_batchDepth == 0)) ? (function() {
   PRIMITIVES["dom-get-prop"] = domGetProp;
   PRIMITIVES["dom-set-prop"] = domSetProp;
   PRIMITIVES["dom-call-method"] = domCallMethod;
+  PRIMITIVES["dom-post-message"] = domPostMessage;
   PRIMITIVES["stop-propagation"] = stopPropagation_;
   PRIMITIVES["error-message"] = errorMessage;
   PRIMITIVES["schedule-idle"] = scheduleIdle;

shared/static/scripts/sx-sw.js

@@ -14,7 +14,7 @@
 var IDB_NAME = "sx-offline";
 var IDB_VERSION = 1;
 var IDB_STORE = "responses";
-var STATIC_CACHE = "sx-static-v1";
+var STATIC_CACHE = "sx-static-v2";
 
 // ---------------------------------------------------------------------------
 // IndexedDB helpers

shared/sx/ref/platform_js.py

@@ -1659,12 +1659,20 @@ PLATFORM_DOM_JS = """
   function domCallMethod() {
     var obj = arguments[0], method = arguments[1];
     var args = Array.prototype.slice.call(arguments, 2);
-    console.log("[sx] dom-call-method:", obj, method, args);
     if (obj && typeof obj[method] === 'function') {
       try { return obj[method].apply(obj, args); }
       catch(e) { console.error("[sx] dom-call-method error:", e); return NIL; }
     }
-    console.warn("[sx] dom-call-method: method not found or obj null", obj, method);
+    return NIL;
+  }
+  // Post a message to an iframe's contentWindow without exposing the cross-origin
+  // Window object to the SX evaluator (which would trigger _thunk access errors).
+  function domPostMessage(iframe, msg, origin) {
+    try {
+      if (iframe && iframe.contentWindow) {
+        iframe.contentWindow.postMessage(msg, origin || '*');
+      }
+    } catch(e) { console.error("[sx] domPostMessage error:", e); }
     return NIL;
   }
 
@@ -2886,6 +2894,7 @@ def fixups_js(has_html, has_sx, has_dom, has_signals=False, has_deps=False, has_
   PRIMITIVES["dom-get-prop"] = domGetProp;
   PRIMITIVES["dom-set-prop"] = domSetProp;
   PRIMITIVES["dom-call-method"] = domCallMethod;
+  PRIMITIVES["dom-post-message"] = domPostMessage;
   PRIMITIVES["stop-propagation"] = stopPropagation_;
   PRIMITIVES["error-message"] = errorMessage;
   PRIMITIVES["schedule-idle"] = scheduleIdle;

sx/bp/pages/routes.py

@@ -1049,23 +1049,6 @@ def register(url_prefix: str = "/") -> Blueprint:
         resp.headers["SX-Retarget"] = "#ref-hdr-retarget-alt"
         return resp
 
-    # --- Random video (marsh demo: reactive click + hypermedia fetch) ---
-
-    _last_video = {"id": ""}
-
-    @bp.get("/api/random-video")
-    async def api_random_video():
-        from shared.sx.helpers import sx_response
-        videos = ["mSil_hBqbac", "-EX4mgvnSc8", "maOM81a-Gyg", "OHPJemGxUjE"]
-        available = [v for v in videos if v != _last_video["id"]]
-        video_id = random.choice(available)
-        _last_video["id"] = video_id
-        return sx_response(f'(~video-embed :video-id "{video_id}")')
-
-    @bp.get("/api/clear-video")
-    async def api_clear_video():
-        return Response("", content_type="text/html")
-
     # --- Event demos ---
 
     @bp.get("/geography/hypermedia/reference/api/error-500")

sx/sx/docs-content.sx

@@ -2,9 +2,7 @@
 
 (defcomp ~sx-home-content ()
   (div :id "main-content" :class "max-w-3xl mx-auto px-4 py-6"
-    (~doc-code :code (highlight (component-source "~sx-header") "lisp"))
-    (~doc-code :code (highlight (component-source "~video-player") "lisp"))
-    (~doc-code :code (highlight (component-source "~video-embed") "lisp"))))
+    (~doc-code :code (highlight (component-source "~sx-header") "lisp"))))
 
 (defcomp ~docs-introduction-content ()
   (~doc-page :title "Introduction"

sx/sx/layouts.sx

@@ -32,7 +32,7 @@
           (span :style (str (display "block") (mb 2)
                             (cssx (:text (colour "violet" 699) (size "4xl") (weight "bold") (family "mono"))))
             "(<sx>)")))
-      ;; Tagline — NOT in anchor. Clicking "reactive" cycles colour + fetches video.
+      ;; Tagline — clicking "reactive" cycles colour.
       (p :style (str (mb 1) (cssx (:text (colour "stone" 500) (size "lg"))))
         "Framework free "
         (span
@@ -42,15 +42,7 @@
           :on-click (fn (e)
             (batch (fn ()
               (swap! idx inc)
-              (reset! shade (+ 400 (* (mod (* (deref idx) 137) 5) 50)))))
-            ;; Only fetch video if none loaded (marsh: reactive + conditional hypermedia)
-            (let ((embed (dom-query-by-id "video-embed")))
-              (when (not (dom-get-prop embed "firstChild"))
-                (dom-dispatch (dom-get-prop e "currentTarget") "fetch-video" {}))))
-          :sx-get "/api/random-video"
-          :sx-target "#video-embed"
-          :sx-swap "innerHTML"
-          :sx-trigger "fetch-video"
+              (reset! shade (+ 400 (* (mod (* (deref idx) 137) 5) 50))))))
           "reactive")
         " hypermedia")
       ;; Lake: server morphs copyright on navigation without disturbing signals.
@@ -62,12 +54,6 @@
                               "margin-left:0.5em;")
               (str "· " path))))))))
 
-;; Video player island — defisland so the morph algorithm preserves it across
-;; navigations. Content swapped in via sx-get from the reactive word click.
-;; Empty initially (zero height). Iframe provides height when loaded.
-(defisland ~video-player ()
-  (div :id "video-embed"
-       :style "position:relative;width:20rem;max-width:66vw;"))
 
 ;; @css grid grid-cols-3
 
@@ -147,11 +133,6 @@
              :style (str "opacity:" (+ (* (/ 1 depth) 0.75) 0.25) ";"
                          "transition:opacity 0.3s;")
           (~sx-header :path (or path "/")))
-        ;; Video island — preserved across navigation morphs (like ~sx-header).
-        ;; Outside logo-opacity so it doesn't fade.
-        ;; Marsh demo: reactive click triggers hypermedia fetch, result lands here.
-        ;; Island renders as inline <span>; force it to block so margin:auto centers.
-        (div :style "display:flex;justify-content:center;" (~video-player))
         ;; Sibling arrows for EVERY level in the trail
         ;; Trail row i is level (i+2) of depth — opacity = (i+2)/depth
         ;; Last row (leaf) gets is-leaf for larger current page title

sx/sxc/home.sx

@@ -1,34 +1,5 @@
 ;; SX docs — home page components
 
-;; YouTube video embed — rendered client-side from video ID returned by /api/random-video.
-;; Marsh demo: server picks video (hypermedia), island controls playback (reactive).
-;; Play/pause uses YouTube postMessage API via dom-call-method — no iframe reload.
-(defcomp ~video-embed (&key video-id)
-  (let ((playing (signal true)))
-    (<>
-      ;; Close button — clears via hypermedia
-      (button
-        :sx-get "/api/clear-video" :sx-target "#video-embed"
-        :sx-swap "innerHTML"
-        :style "position:absolute;top:-0.5rem;right:-0.5rem;width:1.25rem;height:1.25rem;border-radius:50%;border:none;background:rgba(0,0,0,0.5);color:white;font-size:0.75rem;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:10;"
-        "x")
-      ;; Play/pause button — reactive signal toggles YouTube via postMessage
-      (button
-        :on-click (fn (e)
-          (let ((iframe (dom-query "#video-iframe"))
-                (win (dom-get-prop iframe "contentWindow"))
-                (cmd (if (deref playing) "pauseVideo" "playVideo")))
-            (dom-call-method win "postMessage"
-              (str "{\"event\":\"command\",\"func\":\"" cmd "\",\"args\":[]}")
-              "https://www.youtube.com")
-            (reset! playing (not (deref playing)))))
-        :style "position:absolute;top:1rem;right:-0.5rem;width:1.25rem;height:1.25rem;border-radius:50%;border:none;background:rgba(0,0,0,0.5);color:white;font-size:0.75rem;line-height:1;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:10;"
-        (if (deref playing) "||" ">"))
-      ;; Iframe — stays in DOM, playback controlled via postMessage
-      (iframe :id "video-iframe"
-        :src (str "https://www.youtube.com/embed/" video-id "?autoplay=1&enablejsapi=1&controls=0&modestbranding=1&rel=0")
-        :allow "accelerometer; autoplay; encrypted-media"
-        :style "width:100%;aspect-ratio:16/9;border-radius:0.5rem;border:none;pointer-events:none;"))))
 
 (defcomp ~sx-hero (&key &rest children)
   (div :class "max-w-4xl mx-auto px-6 py-16 text-center"