A benchmark for a performance issue when removing a named property

benchmark/dom/index.js

@@ -3,5 +3,6 @@
 module.exports = {
   construction: require("./construction"),
   "tree-modification": require("./tree-modification"),
-  "compare-document-position": require("./compare-document-position")
+  "compare-document-position": require("./compare-document-position"),
+  "named-properties": require("./named-properties")
 };

benchmark/dom/named-properties.js

@@ -0,0 +1,34 @@
+"use strict";
+const suite = require("../document-suite");
+
+exports["setAttribute(): Remove a named property from window"] = function () {
+  const NODES = 1000;
+  let nodes;
+  let parent;
+
+  return suite({
+    setup: function (document) {
+      parent = document.createElement("div");
+
+      nodes = new Array(NODES);
+      for (let i = 0; i < NODES; ++i) {
+        const node = document.createElement("span");
+        nodes[i] = node;
+        node.setAttribute("id", "named" + i);
+        parent.appendChild(node);
+      }
+
+      document.body.appendChild(parent);
+    },
+    tearDown: function(document) {
+      document.body.removeChild(parent);
+      nodes = null;
+      parent = null;
+    },
+    fn: function () {
+      for (let i = 0; i < NODES; ++i) {
+        nodes[i].removeAttribute("id");
+      }
+    }
+  });
+};