Add benchmark for creating a large text node

benchmark/html/index.js

@@ -0,0 +1,5 @@
+"use strict";
+
+module.exports = {
+  parsing: require("./parsing")
+};

benchmark/html/parsing.js

@@ -0,0 +1,12 @@
+"use strict";
+const suite = require("../document-suite");
+
+// Measures the time spent parsing and creating a large text node
+// https://github.com/jsdom/jsdom/pull/2419
+
+exports.text = suite(document => {
+  document.body.innerHTML = `
+  <p>
+    ${"Some methods have unexpected implications for performance. ".repeat(5000)}
+  </p>`;
+});

benchmark/index.js

@@ -2,7 +2,8 @@
 
 module.exports = {
   jsdom: require("./jsdom"),
-  dom: require("./dom")
+  dom: require("./dom"),
+  html: require("./html")
 };
 
 require("./prepare-suites")("", module.exports);