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diff --git a/examples/helloworld/HelloWorld.scala b/examples/helloworld/HelloWorld.scala
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+/* Scala.js example code
+ * Public domain
+ * @author  Sébastien Doeraene
+ */
+
+package helloworld
+
+import scala.scalajs.js
+import js.annotation.JSName
+
+object HelloWorld extends js.JSApp {
+  def main() {
+    if (!(!js.Dynamic.global.document) &&
+        !(!js.Dynamic.global.document.getElementById("playground"))) {
+      sayHelloFromDOM()
+      sayHelloFromTypedDOM()
+      sayHelloFromJQuery()
+      sayHelloFromTypedJQuery()
+    } else {
+      println("Hello world!")
+    }
+  }
+
+  def sayHelloFromDOM() {
+    val document = js.Dynamic.global.document
+    val playground = document.getElementById("playground")
+
+    val newP = document.createElement("p")
+    newP.innerHTML = "Hello world! <i>-- DOM</i>"
+    playground.appendChild(newP)
+  }
+
+  def sayHelloFromTypedDOM() {
+    val document = window.document
+    val playground = document.getElementById("playground")
+
+    val newP = document.createElement("p")
+    newP.innerHTML = "Hello world! <i>-- typed DOM</i>"
+    playground.appendChild(newP)
+  }
+
+  def sayHelloFromJQuery() {
+    // val $ is fine too, but not very recommended in Scala code
+    val jQuery = js.Dynamic.global.jQuery
+    val newP = jQuery("<p>").html("Hello world! <i>-- jQuery</i>")
+    newP.appendTo(jQuery("#playground"))
+  }
+
+  def sayHelloFromTypedJQuery() {
+    val jQuery = helloworld.JQuery
+    val newP = jQuery("<p>").html("Hello world! <i>-- typed jQuery</i>")
+    newP.appendTo(jQuery("#playground"))
+  }
+}
+
+object window extends js.GlobalScope {
+  val document: DOMDocument = js.native
+
+  def alert(msg: String): Unit = js.native
+}
+
+trait DOMDocument extends js.Object {
+  def getElementById(id: String): DOMElement = js.native
+  def createElement(tag: String): DOMElement = js.native
+}
+
+trait DOMElement extends js.Object {
+  var innerHTML: String = js.native
+
+  def appendChild(child: DOMElement): Unit = js.native
+}
+
+@JSName("jQuery")
+object JQuery extends js.Object {
+  def apply(selector: String): JQuery = js.native
+}
+
+trait JQuery extends js.Object {
+  def text(value: String): JQuery = js.native
+  def text(): String = js.native
+
+  def html(value: String): JQuery = js.native
+  def html(): String = js.native
+
+  def appendTo(parent: JQuery): JQuery = js.native
+}