diff --git a/lib/hyperscript/compiler.sx b/lib/hyperscript/compiler.sx
index 5cd46e2b..62cc8074 100644
--- a/lib/hyperscript/compiler.sx
+++ b/lib/hyperscript/compiler.sx
@@ -827,6 +827,10 @@
                 (list (quote dom-remove) (hs-to-sx (nth ast 1))))
               ((= head (quote empty-target))
                 (list (quote hs-empty-target!) (hs-to-sx (nth ast 1))))
+              ((= head (quote open-element))
+                (list (quote hs-open!) (hs-to-sx (nth ast 1))))
+              ((= head (quote close-element))
+                (list (quote hs-close!) (hs-to-sx (nth ast 1))))
               ((= head (quote swap!))
                 (let
                   ((lhs (nth ast 1)) (rhs (nth ast 2)))
diff --git a/lib/hyperscript/parser.sx b/lib/hyperscript/parser.sx
index 951e7f82..4a5bcad6 100644
--- a/lib/hyperscript/parser.sx
+++ b/lib/hyperscript/parser.sx
@@ -1495,6 +1495,20 @@
             ((lhs (parse-expr)))
             (match-kw "with")
             (let ((rhs (parse-expr))) (list (quote swap!) lhs rhs)))))
+      (define
+        parse-open-cmd
+        (fn
+          ()
+          (let
+            ((target (cond ((at-end?) (list (quote me))) ((and (= (tp-type) "keyword") (or (= (tp-val) "then") (= (tp-val) "end"))) (list (quote me))) (true (parse-expr)))))
+            (list (quote open-element) target))))
+      (define
+        parse-close-cmd
+        (fn
+          ()
+          (let
+            ((target (cond ((at-end?) (list (quote me))) ((and (= (tp-type) "keyword") (or (= (tp-val) "then") (= (tp-val) "end"))) (list (quote me))) (true (parse-expr)))))
+            (list (quote close-element) target))))
       (define
         parse-cmd
         (fn
@@ -1582,6 +1596,10 @@
                 (do (adv!) (parse-empty-cmd)))
               ((and (= typ "keyword") (= val "swap"))
                 (do (adv!) (parse-swap-cmd)))
+              ((and (= typ "keyword") (= val "open"))
+                (do (adv!) (parse-open-cmd)))
+              ((and (= typ "keyword") (= val "close"))
+                (do (adv!) (parse-close-cmd)))
               (true (parse-expr))))))
       (define
         parse-cmd-list
@@ -1630,7 +1648,9 @@
                 (= v "focus")
                 (= v "empty")
                 (= v "clear")
-                (= v "swap"))))
+                (= v "swap")
+                (= v "open")
+                (= v "close"))))
           (define
             cl-collect
             (fn
diff --git a/lib/hyperscript/runtime.sx b/lib/hyperscript/runtime.sx
index fca57e9a..06d40be3 100644
--- a/lib/hyperscript/runtime.sx
+++ b/lib/hyperscript/runtime.sx
@@ -475,8 +475,30 @@
             ((= tag "FORM") (dom-set-inner-html target ""))
             (true (dom-set-inner-html target ""))))))))
 ;; Collection: split by
-(define hs-first (fn (lst) (first lst)))
+(define
+  hs-open!
+  (fn
+    (el)
+    (let
+      ((tag (dom-get-prop el "tagName")))
+      (if
+        (= tag "DIALOG")
+        (host-call el "showModal")
+        (dom-set-prop el "open" true)))))
 ;; Collection: joined by
+(define
+  hs-close!
+  (fn
+    (el)
+    (let
+      ((tag (dom-get-prop el "tagName")))
+      (if
+        (= tag "DIALOG")
+        (host-call el "close")
+        (dom-set-prop el "open" false)))))
+
+(define hs-first (fn (lst) (first lst)))
+
 (define hs-last (fn (lst) (last lst)))
 
 (define
diff --git a/lib/hyperscript/tokenizer.sx b/lib/hyperscript/tokenizer.sx
index c0a7ceed..8c473703 100644
--- a/lib/hyperscript/tokenizer.sx
+++ b/lib/hyperscript/tokenizer.sx
@@ -119,6 +119,8 @@
     "empty"
     "clear"
     "swap"
+    "open"
+    "close"
     "exists"
     "matches"
     "contains"