diff --git a/dist/details-element-polyfill.js b/dist/details-element-polyfill.js
index ee20b5a..473ad23 100644
--- a/dist/details-element-polyfill.js
+++ b/dist/details-element-polyfill.js
@@ -1,24 +1,15 @@
 /*
-Details Element Polyfill 2.3.1
+Details Element Polyfill 2.4.0
 Copyright © 2019 Javan Makhmali
  */
 (function() {
   "use strict";
   var element = document.createElement("details");
-  element.innerHTML = "<summary>a</summary>b";
-  element.setAttribute("style", "position: absolute; left: -9999px");
+  var elementIsNative = typeof HTMLDetailsElement != "undefined" && element instanceof HTMLDetailsElement;
   var support = {
-    open: "open" in element && elementExpands(),
+    open: "open" in element || elementIsNative,
     toggle: "ontoggle" in element
   };
-  function elementExpands() {
-    (document.body || document.documentElement).appendChild(element);
-    var closedHeight = element.offsetHeight;
-    element.open = true;
-    var openedHeight = element.offsetHeight;
-    element.parentNode.removeChild(element);
-    return closedHeight != openedHeight;
-  }
   var styles = '\ndetails, summary {\n  display: block;\n}\ndetails:not([open]) > *:not(summary) {\n  display: none;\n}\nsummary::before {\n  content: "►";\n  padding-right: 0.3rem;\n  font-size: 0.6rem;\n  cursor: default;\n}\n[open] > summary::before {\n  content: "▼";\n}\n';
   var _ref = [], forEach = _ref.forEach, slice = _ref.slice;
   if (!support.open) {
diff --git a/package.json b/package.json
index bc9dafd..dd42a03 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "details-element-polyfill",
-  "version": "2.3.1",
+  "version": "2.4.0",
   "description": "HTML <details> element polyfill",
   "main": "dist/details-element-polyfill.js",
   "files": [