Implement 7 missing sx attributes: boost, preload, preserve, indicator, validate, ignore, optimistic

Add sx-preserve/sx-ignore (morph skip), sx-indicator (loading element),
sx-validate (form validation), sx-boost (progressive enhancement),
sx-preload (hover prefetch with 30s cache), and sx-optimistic (instant
UI preview with rollback). Move all from HTMX_MISSING_ATTRS to
SX_UNIQUE_ATTRS with full ATTR_DETAILS docs and reference.sx demos.

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

shared/static/scripts/sx.js

@@ -1579,6 +1579,14 @@
       el.classList.add("sx-request");
       el.setAttribute("aria-busy", "true");
 
+      // sx-indicator: show indicator element
+      var indicatorSel = el.getAttribute("sx-indicator");
+      var indicatorEl = indicatorSel ? (document.querySelector(indicatorSel) || el.closest(indicatorSel)) : null;
+      if (indicatorEl) {
+        indicatorEl.classList.add("sx-request");
+        indicatorEl.style.display = "";
+      }
+
       var fetchOpts = { method: method, headers: headers, signal: ctrl.signal };
       // Cross-origin credentials for known subdomains
       try {
@@ -1590,9 +1598,16 @@
       } catch (e) {}
       if (body && method !== "GET") fetchOpts.body = body;
 
-      return fetch(url, fetchOpts).then(function (resp) {
+      // sx-preload: use cached response if available
+      var preloaded = method === "GET" ? _getPreloaded(url) : null;
+      var fetchPromise = preloaded
+        ? Promise.resolve({ ok: true, status: 200, headers: new Headers({ "Content-Type": preloaded.contentType }), text: function () { return Promise.resolve(preloaded.text); }, _preloaded: true })
+        : fetch(url, fetchOpts);
+
+      return fetchPromise.then(function (resp) {
         el.classList.remove("sx-request");
         el.removeAttribute("aria-busy");
+        if (indicatorEl) { indicatorEl.classList.remove("sx-request"); indicatorEl.style.display = "none"; }
 
         if (!resp.ok) {
           dispatch(el, "sx:responseError", { response: resp, status: resp.status });
@@ -1709,6 +1724,7 @@
       }).catch(function (err) {
         el.classList.remove("sx-request");
         el.removeAttribute("aria-busy");
+        if (indicatorEl) { indicatorEl.classList.remove("sx-request"); indicatorEl.style.display = "none"; }
         if (err.name === "AbortError") return;
         dispatch(el, "sx:sendError", { error: err });
         return _handleRetry(el, verbInfo, extraParams);
@@ -1723,6 +1739,9 @@
      * keyed (id) elements.
      */
     function _morphDOM(oldNode, newNode) {
+      // sx-preserve / sx-ignore: skip morphing entirely
+      if (oldNode.hasAttribute && (oldNode.hasAttribute("sx-preserve") || oldNode.hasAttribute("sx-ignore"))) return;
+
       // Different node types or tag names → replace wholesale
       if (oldNode.nodeType !== newNode.nodeType ||
           oldNode.nodeName !== newNode.nodeName) {
@@ -1805,10 +1824,13 @@
         }
       }
 
-      // Remove leftover old children
+      // Remove leftover old children (skip sx-preserve / sx-ignore)
       while (oi < oldChildren.length) {
         var leftover = oldChildren[oi];
-        if (leftover.parentNode === oldParent) oldParent.removeChild(leftover);
+        if (leftover.parentNode === oldParent &&
+            !(leftover.hasAttribute && (leftover.hasAttribute("sx-preserve") || leftover.hasAttribute("sx-ignore")))) {
+          oldParent.removeChild(leftover);
+        }
         oi++;
       }
     }
@@ -1923,7 +1945,18 @@
     function _swapContent(target, html, strategy) {
       switch (strategy) {
         case "innerHTML":
+          // Detach sx-preserve elements, swap, then re-attach
+          var preserved = [];
+          target.querySelectorAll("[sx-preserve][id]").forEach(function (el) {
+            preserved.push({ id: el.id, node: el });
+            el.parentNode.removeChild(el);
+          });
           target.innerHTML = html;
+          preserved.forEach(function (p) {
+            var placeholder = target.querySelector("#" + CSS.escape(p.id));
+            if (placeholder) placeholder.parentNode.replaceChild(p.node, placeholder);
+            else target.appendChild(p.node);
+          });
           break;
         case "outerHTML":
           var tgt = target;
@@ -2043,17 +2076,49 @@
         // For links, prevent navigation
         if (eventName === "click" && el.tagName === "A") e.preventDefault();
 
+        // sx-validate: run validation before request
+        var validateAttr = el.getAttribute("sx-validate");
+        if (validateAttr === null) {
+          var vForm = el.closest("[sx-validate]");
+          if (vForm) validateAttr = vForm.getAttribute("sx-validate");
+        }
+        if (validateAttr !== null) {
+          var formToValidate = el.tagName === "FORM" ? el : el.closest("form");
+          if (formToValidate && !formToValidate.reportValidity()) {
+            dispatch(el, "sx:validationFailed", {});
+            return;
+          }
+          // Custom validator function
+          if (validateAttr && validateAttr !== "true" && validateAttr !== "") {
+            var validatorFn = window[validateAttr];
+            if (typeof validatorFn === "function" && !validatorFn(el)) {
+              dispatch(el, "sx:validationFailed", {});
+              return;
+            }
+          }
+        }
+
         // changed modifier: only fire if value changed
         if (mods.changed && el.value !== undefined) {
           if (el.value === lastVal) return;
           lastVal = el.value;
         }
 
+        // sx-optimistic: apply preview before request
+        var optimisticState = _applyOptimistic(el);
+
+        var _execAndReconcile = function () {
+          var p = executeRequest(el, verbInfo);
+          if (optimisticState && p && p.catch) {
+            p.catch(function () { _revertOptimistic(optimisticState); });
+          }
+        };
+
         if (mods.delay) {
           clearTimeout(timer);
-          timer = setTimeout(function () { executeRequest(el, verbInfo); }, mods.delay);
+          timer = setTimeout(_execAndReconcile, mods.delay);
         } else {
-          executeRequest(el, verbInfo);
+          _execAndReconcile();
         }
       };
 
@@ -2173,6 +2238,162 @@
       }
     }
 
+    // ---- sx-optimistic ----------------------------------------------------
+
+    function _applyOptimistic(el) {
+      var directive = el.getAttribute("sx-optimistic");
+      if (!directive) return null;
+      var target = resolveTarget(el, null) || el;
+      var state = { target: target, directive: directive };
+
+      if (directive === "remove") {
+        state.display = target.style.display;
+        state.opacity = target.style.opacity;
+        target.style.opacity = "0";
+        target.style.pointerEvents = "none";
+      } else if (directive === "disable") {
+        state.disabled = target.disabled;
+        target.disabled = true;
+      } else if (directive.indexOf("add-class:") === 0) {
+        var cls = directive.substring(10);
+        state.addClass = cls;
+        target.classList.add(cls);
+      }
+      return state;
+    }
+
+    function _revertOptimistic(state) {
+      if (!state) return;
+      var target = state.target;
+      if (state.directive === "remove") {
+        target.style.opacity = state.opacity || "";
+        target.style.pointerEvents = "";
+      } else if (state.directive === "disable") {
+        target.disabled = state.disabled || false;
+      } else if (state.addClass) {
+        target.classList.remove(state.addClass);
+      }
+    }
+
+    // ---- sx-preload -------------------------------------------------------
+
+    var _preloadCache = {};
+    var _PRELOAD_TTL = 30000; // 30 seconds
+
+    function _bindPreload(el) {
+      if (!el.hasAttribute("sx-preload")) return;
+      var mode = el.getAttribute("sx-preload") || "mousedown";
+      var events = mode === "mouseover" ? ["mouseenter", "focusin"] : ["mousedown", "focusin"];
+      var debounceTimer = null;
+      var debounceMs = mode === "mouseover" ? 100 : 0;
+
+      events.forEach(function (evt) {
+        el.addEventListener(evt, function () {
+          var verb = getVerb(el);
+          if (!verb) return;
+          var url = verb.url;
+          var cached = _preloadCache[url];
+          if (cached && (Date.now() - cached.timestamp < _PRELOAD_TTL)) return; // already cached
+
+          if (debounceMs) {
+            clearTimeout(debounceTimer);
+            debounceTimer = setTimeout(function () { _doPreload(url); }, debounceMs);
+          } else {
+            _doPreload(url);
+          }
+        });
+      });
+    }
+
+    function _doPreload(url) {
+      var headers = { "SX-Request": "true", "SX-Current-URL": location.href };
+      var cssH = _getSxCssHeader();
+      if (cssH) headers["SX-Css"] = cssH;
+      var loadedN = Object.keys(_componentEnv).filter(function (k) { return k.charAt(0) === "~"; });
+      if (loadedN.length) headers["SX-Components"] = loadedN.join(",");
+
+      fetch(url, { headers: headers }).then(function (resp) {
+        if (!resp.ok) return;
+        var ct = resp.headers.get("Content-Type") || "";
+        return resp.text().then(function (text) {
+          _preloadCache[url] = { text: text, contentType: ct, timestamp: Date.now() };
+        });
+      }).catch(function () { /* ignore preload errors */ });
+    }
+
+    function _getPreloaded(url) {
+      var cached = _preloadCache[url];
+      if (!cached) return null;
+      if (Date.now() - cached.timestamp > _PRELOAD_TTL) {
+        delete _preloadCache[url];
+        return null;
+      }
+      delete _preloadCache[url]; // consume once
+      return cached;
+    }
+
+    // ---- sx-boost ---------------------------------------------------------
+
+    function _processBoosted(root) {
+      var boostContainers = root.querySelectorAll("[sx-boost]");
+      if (root.matches && root.matches("[sx-boost]")) {
+        _boostDescendants(root);
+      }
+      for (var i = 0; i < boostContainers.length; i++) {
+        _boostDescendants(boostContainers[i]);
+      }
+    }
+
+    function _boostDescendants(container) {
+      // Boost links
+      var links = container.querySelectorAll("a[href]");
+      for (var i = 0; i < links.length; i++) {
+        var link = links[i];
+        if (link[PROCESSED] || link[PROCESSED + "boost"]) continue;
+        var href = link.getAttribute("href");
+        // Skip anchors, external, javascript:, mailto:, already sx-processed
+        if (!href || href.charAt(0) === "#" || href.indexOf("javascript:") === 0 ||
+            href.indexOf("mailto:") === 0 || !sameOrigin(href) ||
+            link.hasAttribute("sx-get") || link.hasAttribute("sx-post") ||
+            link.hasAttribute("sx-disable")) continue;
+        link[PROCESSED + "boost"] = true;
+        (function (el, url) {
+          el.addEventListener("click", function (e) {
+            e.preventDefault();
+            executeRequest(el, { method: "GET", url: url }).then(function () {
+              try { history.pushState({ sxUrl: url, scrollY: window.scrollY }, "", url); } catch (err) {}
+            });
+          });
+        })(link, href);
+        // Default target for boosted links
+        if (!link.hasAttribute("sx-target")) link.setAttribute("sx-target", "#main-panel");
+        if (!link.hasAttribute("sx-swap")) link.setAttribute("sx-swap", "innerHTML");
+        if (!link.hasAttribute("sx-select")) link.setAttribute("sx-select", "#main-panel");
+      }
+
+      // Boost forms
+      var forms = container.querySelectorAll("form");
+      for (var j = 0; j < forms.length; j++) {
+        var form = forms[j];
+        if (form[PROCESSED] || form[PROCESSED + "boost"]) continue;
+        if (form.hasAttribute("sx-get") || form.hasAttribute("sx-post") ||
+            form.hasAttribute("sx-disable")) continue;
+        form[PROCESSED + "boost"] = true;
+        (function (el) {
+          var method = (el.getAttribute("method") || "GET").toUpperCase();
+          var action = el.getAttribute("action") || location.href;
+          el.addEventListener("submit", function (e) {
+            e.preventDefault();
+            executeRequest(el, { method: method, url: action }).then(function () {
+              try { history.pushState({ sxUrl: action, scrollY: window.scrollY }, "", action); } catch (err) {}
+            });
+          });
+        })(form);
+        if (!form.hasAttribute("sx-target")) form.setAttribute("sx-target", "#main-panel");
+        if (!form.hasAttribute("sx-swap")) form.setAttribute("sx-swap", "innerHTML");
+      }
+    }
+
     // ---- Process function -------------------------------------------------
 
     function process(root) {
@@ -2191,6 +2412,9 @@
         _processOne(elements[i]);
       }
 
+      // Process sx-boost containers
+      _processBoosted(root);
+
       // Bind sx-on:* handlers on all elements
       var allOnEls = root.querySelectorAll("[sx-on\\:beforeRequest],[sx-on\\:afterRequest],[sx-on\\:afterSwap],[sx-on\\:afterSettle],[sx-on\\:responseError]");
       allOnEls.forEach(function (el) {
@@ -2210,6 +2434,7 @@
       if (!verbInfo) return;
 
       bindTriggers(el, verbInfo);
+      _bindPreload(el);
     }
 
     // ---- Public API -------------------------------------------------------

sx/content/pages.py

@@ -117,20 +117,17 @@ BEHAVIOR_ATTRS = [
 
 SX_UNIQUE_ATTRS = [
     ("sx-retry", "Exponential backoff retry on request failure", True),
+    ("sx-boost", "Progressively enhance all links and forms in a container with AJAX navigation", True),
+    ("sx-preload", "Preload content on hover/focus for instant response on click", True),
+    ("sx-preserve", "Preserve element across swaps — keeps DOM state, event listeners, and scroll position", True),
+    ("sx-indicator", "CSS selector for a loading indicator element to show/hide during requests", True),
+    ("sx-validate", "Run browser constraint validation (or custom validator) before sending the request", True),
+    ("sx-ignore", "Ignore element and its subtree during morph/swap — no updates applied", True),
+    ("sx-optimistic", "Apply optimistic UI updates immediately, reconcile on server response", True),
     ("data-sx", "Client-side rendering — evaluate the sx source in this attribute and render into the element", True),
     ("data-sx-env", "Provide environment variables as JSON for data-sx rendering", True),
 ]
 
-HTMX_MISSING_ATTRS = [
-    ("hx-boost", "Progressively enhance links and forms (not yet implemented)", False),
-    ("hx-preload", "Preload content on hover/focus (not yet implemented)", False),
-    ("hx-preserve", "Preserve element across swaps (not yet implemented)", False),
-    ("hx-optimistic", "Optimistic UI updates (not yet implemented)", False),
-    ("hx-indicator", "sx uses .sx-request CSS class instead — no dedicated attribute (not yet implemented)", False),
-    ("hx-validate", "Custom validation (not yet implemented — sx has sx-disable)", False),
-    ("hx-ignore", "Ignore element (not yet implemented — sx has sx-disable)", False),
-]
-
 # ---------------------------------------------------------------------------
 # Reference: Headers
 # ---------------------------------------------------------------------------
@@ -719,4 +716,143 @@ ATTR_DETAILS: dict[str, dict] = {
             '  :data-sx-env \'{"title": "Dynamic", "message": "From env"}\')'
         ),
     },
+
+    # --- New attributes ---
+    "sx-boost": {
+        "description": (
+            "Progressively enhance all descendant links and forms with AJAX navigation. "
+            "Links become sx-get requests with pushState, forms become sx-post/sx-get requests. "
+            "No explicit sx-* attributes needed on each link or form — just place sx-boost on a container."
+        ),
+        "demo": "ref-boost-demo",
+        "example": (
+            '(nav :sx-boost "true"\n'
+            '  (a :href "/docs/introduction" "Introduction")\n'
+            '  (a :href "/docs/components" "Components")\n'
+            '  (a :href "/docs/evaluator" "Evaluator"))'
+        ),
+    },
+    "sx-preload": {
+        "description": (
+            "Preload the response in the background when the user hovers over or focuses "
+            "an element with sx-get. When they click, the cached response is used instantly "
+            "instead of making a new request. Cache entries expire after 30 seconds. "
+            'Values: "mousedown" (default, preloads on mousedown) or '
+            '"mouseover" (preloads earlier on hover with 100ms debounce).'
+        ),
+        "demo": "ref-preload-demo",
+        "example": (
+            '(button :sx-get "/reference/api/time"\n'
+            '  :sx-target "#ref-preload-result"\n'
+            '  :sx-swap "innerHTML"\n'
+            '  :sx-preload "mouseover"\n'
+            '  "Hover then click (preloaded)")'
+        ),
+        "handler": (
+            '(defhandler ref-preload-time (&key)\n'
+            '  (let ((now (format-time (now) "%H:%M:%S.%f")))\n'
+            '    (span :class "text-stone-800 text-sm"\n'
+            '      "Preloaded at: " (strong now))))'
+        ),
+    },
+    "sx-preserve": {
+        "description": (
+            "Preserve an element across morph/swap operations. The element must have an id. "
+            "During morphing, the element is kept in place with its full DOM state intact — "
+            "event listeners, scroll position, video playback, user input, and any other state "
+            "are preserved. The incoming version of the element is discarded."
+        ),
+        "demo": "ref-preserve-demo",
+        "example": (
+            '(div :id "my-player" :sx-preserve "true"\n'
+            '  (video :src "/media/clip.mp4" :controls "true"\n'
+            '    "Video playback is preserved across swaps."))'
+        ),
+    },
+    "sx-indicator": {
+        "description": (
+            "Specifies a CSS selector for a loading indicator element. "
+            "The indicator receives the .sx-request class during the request, "
+            "and the class is removed when the request completes (success or error). "
+            "Use CSS to show/hide the indicator based on the .sx-request class."
+        ),
+        "demo": "ref-indicator-demo",
+        "example": (
+            '(button :sx-get "/reference/api/slow-echo"\n'
+            '  :sx-target "#ref-indicator-result"\n'
+            '  :sx-swap "innerHTML"\n'
+            '  :sx-indicator "#ref-spinner"\n'
+            '  "Load (slow)")\n'
+            '\n'
+            '(span :id "ref-spinner"\n'
+            '  :class "hidden sx-request:inline text-violet-600 text-sm"\n'
+            '  "Loading...")'
+        ),
+        "handler": (
+            '(defhandler ref-indicator-slow (&key)\n'
+            '  (sleep 1500)\n'
+            '  (let ((now (format-time (now) "%H:%M:%S")))\n'
+            '    (span "Loaded at " (strong now))))'
+        ),
+    },
+    "sx-validate": {
+        "description": (
+            "Run browser constraint validation before sending the request. "
+            "If validation fails, the request is not sent and an sx:validationFailed "
+            "event is dispatched. Works with standard HTML5 validation attributes "
+            '(required, pattern, minlength, etc). Set to "true" for built-in validation, '
+            "or provide a function name for custom validation."
+        ),
+        "demo": "ref-validate-demo",
+        "example": (
+            '(form :sx-post "/reference/api/greet"\n'
+            '  :sx-target "#ref-validate-result"\n'
+            '  :sx-swap "innerHTML"\n'
+            '  :sx-validate "true"\n'
+            '  (input :type "email" :name "email"\n'
+            '    :required "true"\n'
+            '    :placeholder "Enter email (required)")\n'
+            '  (button :type "submit" "Submit"))'
+        ),
+        "handler": (
+            '(defhandler ref-validate-greet (&key)\n'
+            '  (let ((email (or (form-data "email") "none")))\n'
+            '    (span "Validated: " (strong email))))'
+        ),
+    },
+    "sx-ignore": {
+        "description": (
+            "During morph/swap, this element and its subtree are completely skipped — "
+            "no attribute updates, no child reconciliation, no removal. "
+            "Unlike sx-preserve (which requires an id and preserves by identity), "
+            "sx-ignore works positionally and means 'don\\'t touch this subtree at all.'"
+        ),
+        "demo": "ref-ignore-demo",
+        "example": (
+            '(div :sx-ignore "true"\n'
+            '  (p "This content is never updated by morph/swap.")\n'
+            '  (input :type "text" :placeholder "Type here — preserved"))'
+        ),
+    },
+    "sx-optimistic": {
+        "description": (
+            "Apply a client-side preview of the expected result immediately, "
+            "then reconcile when the server responds. On error, the original state "
+            'is restored. Values: "remove" (hide the target), '
+            '"add-class:<name>" (add a CSS class), "disable" (disable the element).'
+        ),
+        "demo": "ref-optimistic-demo",
+        "example": (
+            '(button :sx-delete "/reference/api/item/opt1"\n'
+            '  :sx-target "#ref-opt-item"\n'
+            '  :sx-swap "delete"\n'
+            '  :sx-optimistic "remove"\n'
+            '  "Delete (optimistic)")'
+        ),
+        "handler": (
+            '(defhandler ref-optimistic-delete (&key)\n'
+            '  (sleep 800)\n'
+            '  "")'
+        ),
+    },
 }

sx/sxc/reference.sx

@@ -406,3 +406,148 @@
     (div :data-sx "(div :class \"p-3 bg-emerald-50 rounded\" (h3 :class \"font-semibold text-emerald-800\" title) (p :class \"text-sm text-stone-600\" message))"
          :data-sx-env "{\"title\": \"Dynamic content\", \"message\": \"Variables passed via data-sx-env are available in the expression.\"}")
     (p :class "text-xs text-stone-400" "The title and message above come from the data-sx-env JSON.")))
+
+;; ---------------------------------------------------------------------------
+;; sx-boost
+;; ---------------------------------------------------------------------------
+
+(defcomp ~ref-boost-demo ()
+  (div :class "space-y-3"
+    (nav :sx-boost "true" :class "flex gap-3"
+      (a :href "/reference/attributes/sx-get"
+        :class "text-violet-600 hover:text-violet-800 underline text-sm"
+        "sx-get")
+      (a :href "/reference/attributes/sx-post"
+        :class "text-violet-600 hover:text-violet-800 underline text-sm"
+        "sx-post")
+      (a :href "/reference/attributes/sx-target"
+        :class "text-violet-600 hover:text-violet-800 underline text-sm"
+        "sx-target"))
+    (p :class "text-xs text-stone-400"
+      "These links use AJAX navigation via sx-boost — no sx-get needed on each link.")))
+
+;; ---------------------------------------------------------------------------
+;; sx-preload
+;; ---------------------------------------------------------------------------
+
+(defcomp ~ref-preload-demo ()
+  (div :class "space-y-3"
+    (button
+      :sx-get "/reference/api/time"
+      :sx-target "#ref-preload-result"
+      :sx-swap "innerHTML"
+      :sx-preload "mouseover"
+      :class "px-4 py-2 bg-violet-600 text-white rounded hover:bg-violet-700 transition-colors text-sm"
+      "Hover then click (preloaded)")
+    (div :id "ref-preload-result"
+      :class "p-3 rounded bg-stone-50 text-stone-400 text-sm"
+      "Hover over the button first, then click — the response is instant.")))
+
+;; ---------------------------------------------------------------------------
+;; sx-preserve
+;; ---------------------------------------------------------------------------
+
+(defcomp ~ref-preserve-demo ()
+  (div :class "space-y-3"
+    (div :class "flex gap-2 items-center"
+      (button
+        :sx-get "/reference/api/time"
+        :sx-target "#ref-preserve-container"
+        :sx-swap "innerHTML"
+        :class "px-4 py-2 bg-violet-600 text-white rounded hover:bg-violet-700 transition-colors text-sm"
+        "Swap container")
+      (span :class "text-xs text-stone-400" "The input below keeps its value across swaps."))
+    (div :id "ref-preserve-container" :class "space-y-2"
+      (input :id "ref-preserved-input" :sx-preserve "true"
+        :type "text" :placeholder "Type here — preserved across swaps"
+        :class "w-full px-3 py-2 border border-stone-300 rounded text-sm")
+      (div :class "p-2 bg-stone-50 rounded text-sm text-stone-600"
+        "This text will be replaced on swap."))))
+
+;; ---------------------------------------------------------------------------
+;; sx-indicator
+;; ---------------------------------------------------------------------------
+
+(defcomp ~ref-indicator-demo ()
+  (div :class "space-y-3"
+    (div :class "flex gap-3 items-center"
+      (button
+        :sx-get "/reference/api/slow-echo"
+        :sx-target "#ref-indicator-result"
+        :sx-swap "innerHTML"
+        :sx-indicator "#ref-spinner"
+        :sx-vals "{\"q\": \"hello\"}"
+        :class "px-4 py-2 bg-violet-600 text-white rounded hover:bg-violet-700 transition-colors text-sm"
+        "Load (slow)")
+      (span :id "ref-spinner"
+        :class "text-violet-600 text-sm"
+        :style "display: none"
+        "Loading..."))
+    (div :id "ref-indicator-result"
+      :class "p-3 rounded bg-stone-50 text-stone-400 text-sm"
+      "Click to load (indicator shows during request).")))
+
+;; ---------------------------------------------------------------------------
+;; sx-validate
+;; ---------------------------------------------------------------------------
+
+(defcomp ~ref-validate-demo ()
+  (div :class "space-y-3"
+    (form
+      :sx-post "/reference/api/greet"
+      :sx-target "#ref-validate-result"
+      :sx-swap "innerHTML"
+      :sx-validate "true"
+      :class "flex gap-2"
+      (input :type "email" :name "name" :required "true"
+        :placeholder "Enter email (required)"
+        :class "flex-1 px-3 py-2 border border-stone-300 rounded text-sm focus:outline-none focus:ring-2 focus:ring-violet-500")
+      (button :type "submit"
+        :class "px-4 py-2 bg-violet-600 text-white rounded hover:bg-violet-700 transition-colors text-sm"
+        "Submit"))
+    (div :id "ref-validate-result"
+      :class "p-3 rounded bg-stone-50 text-stone-400 text-sm"
+      "Submit with invalid/empty email to see validation.")))
+
+;; ---------------------------------------------------------------------------
+;; sx-ignore
+;; ---------------------------------------------------------------------------
+
+(defcomp ~ref-ignore-demo ()
+  (div :class "space-y-3"
+    (button
+      :sx-get "/reference/api/time"
+      :sx-target "#ref-ignore-container"
+      :sx-swap "innerHTML"
+      :class "px-4 py-2 bg-violet-600 text-white rounded hover:bg-violet-700 transition-colors text-sm"
+      "Swap container")
+    (div :id "ref-ignore-container" :class "space-y-2"
+      (div :sx-ignore "true" :class "p-2 bg-amber-50 rounded border border-amber-200"
+        (p :class "text-sm text-amber-800" "This subtree has sx-ignore — it won't change.")
+        (input :type "text" :placeholder "Type here — ignored during swap"
+          :class "mt-1 w-full px-2 py-1 border border-amber-300 rounded text-sm"))
+      (div :class "p-2 bg-stone-50 rounded text-sm text-stone-600"
+        "This text WILL be replaced on swap."))))
+
+;; ---------------------------------------------------------------------------
+;; sx-optimistic
+;; ---------------------------------------------------------------------------
+
+(defcomp ~ref-optimistic-demo ()
+  (div :class "space-y-2"
+    (div :id "ref-opt-item-1"
+      :class "flex items-center justify-between p-2 border border-stone-200 rounded"
+      (span :class "text-sm text-stone-700" "Optimistic item A")
+      (button :sx-delete "/reference/api/item/opt1"
+        :sx-target "#ref-opt-item-1" :sx-swap "delete"
+        :sx-optimistic "remove"
+        :class "text-red-500 text-sm hover:text-red-700" "Remove"))
+    (div :id "ref-opt-item-2"
+      :class "flex items-center justify-between p-2 border border-stone-200 rounded"
+      (span :class "text-sm text-stone-700" "Optimistic item B")
+      (button :sx-delete "/reference/api/item/opt2"
+        :sx-target "#ref-opt-item-2" :sx-swap "delete"
+        :sx-optimistic "remove"
+        :class "text-red-500 text-sm hover:text-red-700" "Remove"))
+    (p :class "text-xs text-stone-400"
+      "Items fade out immediately on click (optimistic), then are removed when the server responds.")))

sx/sxc/sx_components.py

@@ -579,21 +579,19 @@ def _reference_attr_detail_sx(slug: str) -> str:
 
 
 async def _reference_attrs_sx() -> str:
-    from content.pages import REQUEST_ATTRS, BEHAVIOR_ATTRS, SX_UNIQUE_ATTRS, HTMX_MISSING_ATTRS
+    from content.pages import REQUEST_ATTRS, BEHAVIOR_ATTRS, SX_UNIQUE_ATTRS
     req = await _attr_table_sx("Request Attributes", REQUEST_ATTRS)
     beh = await _attr_table_sx("Behavior Attributes", BEHAVIOR_ATTRS)
     uniq = await _attr_table_sx("Unique to sx", SX_UNIQUE_ATTRS)
-    missing = await _attr_table_sx("htmx features not yet in sx", HTMX_MISSING_ATTRS)
     return (
         f'(~doc-page :title "Attribute Reference"'
         f'  (p :class "text-stone-600 mb-6"'
-        f'    "sx attributes mirror htmx where possible. This table shows what exists, '
-        f'what\'s unique to sx, and what\'s not yet implemented.")'
+        f'    "sx attributes mirror htmx where possible. This table shows all '
+        f'available attributes and their status.")'
         f'  (div :class "space-y-8"'
         f'    {req}'
         f'    {beh}'
-        f'    {uniq}'
-        f'    {missing}))'
+        f'    {uniq}))'
     )