Docs update

docs/script/inherited-summary.js

@@ -0,0 +1,28 @@
+(function(){
+  function toggle(ev) {
+    var button = ev.target;
+    var parent = ev.target.parentElement;
+    while(parent) {
+      if (parent.tagName === 'TABLE' && parent.classList.contains('summary')) break;
+      parent = parent.parentElement;
+    }
+
+    if (!parent) return;
+
+    var tbody = parent.querySelector('tbody');
+    if (button.classList.contains('opened')) {
+      button.classList.remove('opened');
+      button.classList.add('closed');
+      tbody.style.display = 'none';
+    } else {
+      button.classList.remove('closed');
+      button.classList.add('opened');
+      tbody.style.display = 'block';
+    }
+  }
+
+  var buttons = document.querySelectorAll('.inherited-summary thead .toggle');
+  for (var i = 0; i < buttons.length; i++) {
+    buttons[i].addEventListener('click', toggle);
+  }
+})();