diff --git a/html/cache-polyfill.js b/html/cache-polyfill.js
new file mode 100644
index 0000000..d5563f0
--- /dev/null
+++ b/html/cache-polyfill.js
@@ -0,0 +1,101 @@
+/*
+ *
+ *  Air Horner
+ *  Copyright 2015 Google Inc. All rights reserved.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License
+ *
+ */
+if (!Cache.prototype.add) {
+  Cache.prototype.add = function add(request) {
+    return this.addAll([request]);
+  };
+}
+
+if (!Cache.prototype.addAll) {
+  Cache.prototype.addAll = function addAll(requests) {
+    var cache = this;
+
+    // Since DOMExceptions are not constructable:
+    function NetworkError(message) {
+      this.name = 'NetworkError';
+      this.code = 19;
+      this.message = message;
+    }
+    NetworkError.prototype = Object.create(Error.prototype);
+
+    return Promise.resolve().then(function() {
+      if (arguments.length < 1) throw new TypeError();
+      
+      // Simulate sequence<(Request or USVString)> binding:
+      var sequence = [];
+
+      requests = requests.map(function(request) {
+        if (request instanceof Request) {
+          return request;
+        }
+        else {
+          return String(request); // may throw TypeError
+        }
+      });
+
+      return Promise.all(
+        requests.map(function(request) {
+          if (typeof request === 'string') {
+            request = new Request(request);
+          }
+
+          var scheme = new URL(request.url).protocol;
+
+          if (scheme !== 'http:' && scheme !== 'https:') {
+            throw new NetworkError("Invalid scheme");
+          }
+
+          return fetch(request.clone());
+        })
+      );
+    }).then(function(responses) {
+      // TODO: check that requests don't overwrite one another
+      // (don't think this is possible to polyfill due to opaque responses)
+      return Promise.all(
+        responses.map(function(response, i) {
+          return cache.put(requests[i], response);
+        })
+      );
+    }).then(function() {
+      return undefined;
+    });
+  };
+}
+
+if (!CacheStorage.prototype.match) {
+  // This is probably vulnerable to race conditions (removing caches etc)
+  CacheStorage.prototype.match = function match(request, opts) {
+    var caches = this;
+
+    return this.keys().then(function(cacheNames) {
+      var match;
+
+      return cacheNames.reduce(function(chain, cacheName) {
+        return chain.then(function() {
+          return match || caches.open(cacheName).then(function(cache) {
+            return cache.match(request, opts);
+          }).then(function(response) {
+            match = response;
+            return match;
+          });
+        });
+      }, Promise.resolve());
+    });
+  };
+}
\ No newline at end of file
diff --git a/html/index.html b/html/index.html
index 0863673..9010fe4 100755
--- a/html/index.html
+++ b/html/index.html
@@ -138,5 +138,12 @@ När jag började informera mig om Universiteter, antagningspoäng och meritvär
 <script src="https://storage.googleapis.com/code.getmdl.io/1.0.1/material.min.js"></script>
 <script src="assets/js/loader.min.js"></script>
 <script src="assets/js/softscrollscript.js"></script>
+<script>
+if('serviceWorker' in navigator) {
+  navigator.serviceWorker
+           .register('/sw.js')
+           .then(function() { console.log("Service Worker Registered"); });
+}
+</script>
 </body>
 </html>
diff --git a/html/sw.js b/html/sw.js
new file mode 100644
index 0000000..2af1f4f
--- /dev/null
+++ b/html/sw.js
@@ -0,0 +1,35 @@
+importScripts('/cache-polyfill.js');
+
+
+self.addEventListener('install', function(e) {
+ e.waitUntil(
+   caches.open('meritkollen').then(function(cache) {
+     return cache.addAll([
+       '/',
+       '/index.html',
+       '/Ekonomi.php',
+       '/Estet.php',
+       '/Natur.php',
+       '/Samhäll.php',
+       '/Teknik.php',
+       '/assets/css/main.min.css',
+       '/assets/img/background.jpg',
+       '/assets/js/calcscript.js',
+       '/assets/js/changeall.js',
+       '/assets/js/loader.js',
+       '/assets/js/loader.min.js',
+       '/assets/js/softscrollscript.js',
+       '/assets/js/sparabetyg.js',
+     ]);
+   })
+ );
+});
+
+self.addEventListener('fetch', function(event) {
+	console.log(event.request.url);
+	event.respondWith(
+	caches.match(event.request).then(function(response) {
+		return response || fetch(event.request);
+	})
+	);
+});
\ No newline at end of file