diff --git a/screenfull/screenfull-tests.ts b/screenfull/screenfull-tests.ts
new file mode 100644
index 000000000..b4cc17421
--- /dev/null
+++ b/screenfull/screenfull-tests.ts
@@ -0,0 +1,62 @@
+/// <reference path="screenfull.d.ts" />
+
+function test_fullscreen_page() {
+  if (screenfull.enabled) {
+    screenfull.request();
+  }
+}
+
+function test_fullscreen_element() {
+  var elem = document.getElementById('target');
+  if (screenfull.enabled) {
+    screenfull.request(elem);
+  }
+}
+
+function test_toggle() {
+  var elem = document.getElementById('target');
+  if (screenfull.enabled) {
+    screenfull.toggle(elem);
+  }
+}
+
+function test_exit() {
+  if (screenfull.enabled) {
+    screenfull.request();
+  }
+  document.getElementById('target').addEventListener('click', function () {
+    if (screenfull.enabled) {
+      screenfull.exit();
+    }
+  })
+}
+
+function test_detect_change() {
+  if (screenfull.enabled) {
+    document.addEventListener(screenfull.raw.fullscreenchange, function () {
+      if (screenfull.isFullscreen) {
+        console.log('fullscreen');
+      } else {
+        console.log('not fullscreen');
+      }
+    });
+  }
+}
+
+function test_detect_error() {
+  if (screenfull.enabled) {
+    document.addEventListener(screenfull.raw.fullscreenerror, function (event) {
+      console.error('Failed to enable fullscreen', event);
+    });
+  } 
+}
+
+function test_access_element() {
+  var elem = document.getElementById('target');
+  if (screenfull.enabled) {
+    screenfull.request(elem);
+    if (elem !== screenfull.element) {
+      alert('incorrect element property');
+    }
+  }
+}
diff --git a/screenfull/screenfull.d.ts b/screenfull/screenfull.d.ts
new file mode 100644
index 000000000..2e5e78deb
--- /dev/null
+++ b/screenfull/screenfull.d.ts
@@ -0,0 +1,26 @@
+// Type definitions for screenfull.js 2.0.0
+// Project: https://github.com/sindresorhus/screenfull.js
+// Definitions by: Ilia Choly <http://github.com/icholy>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+
+declare var screenfull: IScreenfull;
+
+interface IScreenfullRaw {
+  requestFullscreen?: string;
+  exitFullscreen?: string;
+  fullscreenElement?: string;
+  fullscreenEnabled?: string;
+  fullscreenchange?: string;
+  fullscreenerror?: string;
+}
+
+interface IScreenfull {
+  isFullscreen: boolean;
+  element: Element;
+  enabled: boolean;
+  raw: IScreenfullRaw;
+  request(elem?: Element): void;
+  toggle(elem?: Element): void;
+  exit(): void;
+}