diff --git a/htmlfills.js b/htmlfills.js
index 1587b45..6979131 100644
--- a/htmlfills.js
+++ b/htmlfills.js
@@ -70,7 +70,8 @@ document.addEventListener('DOMContentLoaded', function () {
 var polyfills = {
     dialog: {
         supports: 'HTMLDialogElement' in window,
-        js: 'https://cdn.jsdelivr.net/npm/dialog-polyfill@0.5.6/dist/dialog-polyfill.min.js',
+        js: 'https://cdn.jsdelivr.net/gh/nuxodin/dialog-polyfill@0.5.7/dist/dialog-polyfill.min.js',
+        //js: 'https://cdn.jsdelivr.net/npm/dialog-polyfill@0.5.6/dist/dialog-polyfill.min.js',
         //css: 'https://cdn.jsdelivr.net/npm/dialog-polyfill@0.5.6/dialog-polyfill.css',
         onfound: function(el){
             dialogPolyfill.registerDialog(el);
@@ -114,4 +115,4 @@ function loadScript(path, cb, eb) {
 
 
 
-}(window, document);
+}(window, document);
\ No newline at end of file
diff --git a/mod.js b/mod.js
index 429e084..3f1d24d 100644
--- a/mod.js
+++ b/mod.js
@@ -54,14 +54,14 @@ addCombo('cdn.jsdelivr.net/gh/nuxodin/lazyfill@0.5.0/polyfills/Element/combo.js'
     remove:1,
     blur:1, // to use in SVGElement:
     focus:1,
-    contains:1,
+//    contains:1, // moved to Node.prototype
     classList:1,
     getElementsByClassName:1,
     children:1,
 }, Element.prototype);
 
 /* blank object "CSS" needed */
-if (!window.CSS) CSS = {};
+if (!window.CSS) window.CSS = {};
 var lazyfills = {
     Array:{
         from:1,
@@ -90,8 +90,16 @@ var lazyfills = {
         currentScript:1,
         caretRangeFromPoint:1,
     },
+    Node:{
+        prototype:{
+            contains:1,
+            isConnected:1,
+        },
+    },
     Element:{
-        toggleAttribute:1
+        prototype:{
+            toggleAttribute:1
+        }
     },
     HTMLFormElement:{
         prototype:{
@@ -237,6 +245,30 @@ function loadScriptSync(path) {
     }
 }
 
+
+/*
+if (!('contains' in Node.prototype)) {
+    Node.prototype.contains = function(el){
+        if (el instanceof CharacterData) {
+            if (!el.parentNode) return false;
+            el = el.parentNode;
+        }
+        if (this === el) return true;
+        if (this instanceof Document) {
+            return this.documentElement.contains(el)
+        }
+        return HTMLElement.prototype.contains.call(this, el);
+    }
+}
+if (!('isConnected' in Node.prototype)) {
+    Object.defineProperty(Node.prototype, 'isConnected',{
+        get:function(){
+            return this.ownerDocument.contains(this);
+        }
+    })
+}
+*/
+
 /* very small polyfills, they are not worth adding to the service */
 if (!NodeList.prototype.forEach) NodeList.prototype.forEach = Array.prototype.forEach; // ie11
 if (!document.scrollingElement) document.scrollingElement = document.documentElement; // ie11
diff --git a/polyfills/Element/combo.js b/polyfills/Element/combo.js
index ffe4b8b..0a7a451 100644
--- a/polyfills/Element/combo.js
+++ b/polyfills/Element/combo.js
@@ -56,7 +56,7 @@ function mutationMacro(nodes) {
 var props = [
     'blur', // ie11
     'focus',
-    'contains',
+//    'contains', // needed at Node.prototype
     'classList',
     'getElementsByClassName',
     // 'className',
diff --git a/polyfills/Node/prototype/contains.js b/polyfills/Node/prototype/contains.js
new file mode 100644
index 0000000..71c8a12
--- /dev/null
+++ b/polyfills/Node/prototype/contains.js
@@ -0,0 +1,13 @@
+if (!('contains' in Node.prototype)) {
+    Node.prototype.contains = function(el){
+        if (el instanceof CharacterData) {
+            if (!el.parentNode) return false;
+            el = el.parentNode;
+        }
+        if (this === el) return true;
+        if (this instanceof Document) {
+            return this.documentElement.contains(el)
+        }
+        return HTMLElement.prototype.contains.call(this, el);
+    }
+}
diff --git a/polyfills/Node/prototype/isConnected.js b/polyfills/Node/prototype/isConnected.js
new file mode 100644
index 0000000..4c66ae2
--- /dev/null
+++ b/polyfills/Node/prototype/isConnected.js
@@ -0,0 +1,7 @@
+if (!('isConnected' in Node.prototype)) {
+    Object.defineProperty(Node.prototype, 'isConnected',{
+        get:function(){
+            return this.ownerDocument.contains(this);
+        }
+    })
+}
diff --git a/test.html b/test.html
index c6573d1..2dfbac0 100644
--- a/test.html
+++ b/test.html
@@ -33,7 +33,39 @@
   console.log(korean.hourCycle, japanese.hourCycle);
   // expected output: "h24" "h12"
 
-}, 1000)
+}, 1000);
+
+
+/* Node contains tests */
+
+console.log(
+  'document.contains(document)',
+  document.contains(document)
+)
+console.log(
+  'document.documentElement.contains(document)',
+  document.documentElement.contains(document)
+)
+console.log(
+  'document.contains(document.documentElement)',
+  document.contains(document.documentElement)
+)
+console.log(
+  'document.documentElement.contains(document.documentElement)',
+  document.documentElement.contains(document.documentElement)
+)
+var textel = document.body.firstChild;
+console.log(
+  'document.contains(textel)',
+  document.contains(textel)
+)
+
+/* is connected tests */
+
+div = document.createElement('div');
+console.log(div.isConnected);
+document.body.append(div)
+console.log(div.isConnected);
 
 </script>