diff --git a/demos/basic.html b/demos/basic.html
index 977756e7..0e9deab5 100644
--- a/demos/basic.html
+++ b/demos/basic.html
@@ -1,39 +1,41 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Basic demo</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" media="screen" href="../test/main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Basic demo</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="../test/main.css" />
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
-    <div class="screen">
-      <h1>Basic demo</h1>
-      <a href="../test/1.html">Link 1</a>
-      Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
-      tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
-      quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
-      consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
-      cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
-      proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
-      <a href="../test/2.html">Link 2</a>
-    </div>
-    <div class="screen">
-      Lorem ipsum dolor sit amet, consectetur adipisicing elit. Eos, quos?
-      <a href="../test/3.html">Link 3</a>
-        <section id="stuff">
-          <a href="../test/main.css">CSS</a>
-        </section>
-    </div>
-    <div class="screen">
-      <a href="../test/4.html">Link 4</a>
-    </div>
-    <script src="../dist/quicklink.umd.js"></script>
-    <script>
-        quicklink();
-    </script>
+  <div class="screen">
+    <h1>Basic demo</h1>
+    <a href="../test/1.html">Link 1</a>
+    Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod
+    tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
+    quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo
+    consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse
+    cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non
+    proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
+    <a href="../test/2.html">Link 2</a>
+  </div>
+  <div class="screen">
+    Lorem ipsum dolor sit amet, consectetur adipisicing elit. Eos, quos?
+    <a href="../test/3.html">Link 3</a>
+    <section id="stuff">
+      <a href="../test/main.css">CSS</a>
+    </section>
+  </div>
+  <div class="screen">
+    <a href="../test/4.html">Link 4</a>
+  </div>
+  <script src="../dist/quicklink.umd.js"></script>
+  <script>
+    quicklink();
+  </script>
 </body>
-</html>
 
+</html>
\ No newline at end of file
diff --git a/demos/network-idle.html b/demos/network-idle.html
index 8a0025d3..aee38c7d 100644
--- a/demos/network-idle.html
+++ b/demos/network-idle.html
@@ -2,39 +2,40 @@
 <html>
 
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>network-idle-callback demo</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" media="screen" href="../test/main.css" />
-    <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
-    <script>
-        if ('serviceWorker' in navigator) {
-            window.addEventListener('load', function () {
-                navigator.serviceWorker.register('./sw.js').then(function (registration) {
-                    console.log('ServiceWorker registration successful with scope: ', registration.scope);
-                }, function (err) {
-                    console.log('ServiceWorker registration failed: ', err);
-                });
-            });
-        }
-    </script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>network-idle-callback demo</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="../test/main.css">
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
+  <script>
+    if ('serviceWorker' in navigator) {
+      window.addEventListener('load', function () {
+        navigator.serviceWorker.register('./sw.js').then(function (registration) {
+          console.log('ServiceWorker registration successful with scope: ', registration.scope);
+        }, function (err) {
+          console.log('ServiceWorker registration failed: ', err);
+        });
+      });
+    }
+  </script>
 </head>
 
 <body>
-    <p>This demo uses <a href="/~https://github.com/pastelsky/network-idle-callback">network-idle-callback</a> to only prefetch when network activity goes idle in the current tab.</p>
-    <a href="../test/1.html">Link 1</a>
-    <a href="../test/2.html">Link 2</a>
-    <a href="../test/3.html">Link 3</a>
-    <section id="stuff">
-        <a href="../test/main.css">CSS</a>
-    </section>
-    <a href="../test/4.html" style="position:absolute;margin-top:900px;">Link 4</a>
-    <script src="network-idle.js"></script>
-    <script type="module">
-        import quicklink from "../dist/quicklink.mjs";
-        quicklink({timeoutFn: networkIdleCallback});
-    </script>
+  <p>This demo uses <a href="/~https://github.com/pastelsky/network-idle-callback">network-idle-callback</a> to only
+    prefetch when network activity goes idle in the current tab.</p>
+  <a href="../test/1.html">Link 1</a>
+  <a href="../test/2.html">Link 2</a>
+  <a href="../test/3.html">Link 3</a>
+  <section id="stuff">
+    <a href="../test/main.css">CSS</a>
+  </section>
+  <a href="../test/4.html" style="position:absolute;margin-top:900px;">Link 4</a>
+  <script src="network-idle.js"></script>
+  <script type="module">
+    import quicklink from "../dist/quicklink.mjs";
+    quicklink({ timeoutFn: networkIdleCallback });
+  </script>
 </body>
 
-</html>
+</html>
\ No newline at end of file
diff --git a/test/1.html b/test/1.html
index e0f07e11..b0d72d27 100644
--- a/test/1.html
+++ b/test/1.html
@@ -1,14 +1,18 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch experiments</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch experiments</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
 </head>
+
 <body>
-    <h1>Page 1</h1>
-    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Soluta est sint assumenda corrupti minima aut, magnam totam beatae ullam ea iste voluptatum iusto expedita animi rem vitae rerum atque nemo!</p>
+  <h1>Page 1</h1>
+  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Soluta est sint assumenda corrupti minima aut, magnam
+    totam beatae ullam ea iste voluptatum iusto expedita animi rem vitae rerum atque nemo!</p>
 </body>
+
 </html>
\ No newline at end of file
diff --git a/test/2.html b/test/2.html
index ee37fc0e..686fdbb9 100644
--- a/test/2.html
+++ b/test/2.html
@@ -1,14 +1,18 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch experiments</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch experiments</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
 </head>
+
 <body>
-    <h1>Page 2</h1>
-    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Soluta est sint assumenda corrupti minima aut, magnam totam beatae ullam ea iste voluptatum iusto expedita animi rem vitae rerum atque nemo!</p>
+  <h1>Page 2</h1>
+  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Soluta est sint assumenda corrupti minima aut, magnam
+    totam beatae ullam ea iste voluptatum iusto expedita animi rem vitae rerum atque nemo!</p>
 </body>
+
 </html>
\ No newline at end of file
diff --git a/test/3.html b/test/3.html
index a701f44a..0e18e22b 100644
--- a/test/3.html
+++ b/test/3.html
@@ -1,14 +1,18 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch experiments</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch experiments</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
 </head>
+
 <body>
-    <h1>Page 3</h1>
-    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Soluta est sint assumenda corrupti minima aut, magnam totam beatae ullam ea iste voluptatum iusto expedita animi rem vitae rerum atque nemo!</p>
+  <h1>Page 3</h1>
+  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Soluta est sint assumenda corrupti minima aut, magnam
+    totam beatae ullam ea iste voluptatum iusto expedita animi rem vitae rerum atque nemo!</p>
 </body>
+
 </html>
\ No newline at end of file
diff --git a/test/4.html b/test/4.html
index f4508556..8bcf7c9a 100644
--- a/test/4.html
+++ b/test/4.html
@@ -1,14 +1,18 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch experiments</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch experiments</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
 </head>
+
 <body>
-    <h1>Page 4</h1>
-    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Soluta est sint assumenda corrupti minima aut, magnam totam beatae ullam ea iste voluptatum iusto expedita animi rem vitae rerum atque nemo!</p>
+  <h1>Page 4</h1>
+  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Soluta est sint assumenda corrupti minima aut, magnam
+    totam beatae ullam ea iste voluptatum iusto expedita animi rem vitae rerum atque nemo!</p>
 </body>
+
 </html>
\ No newline at end of file
diff --git a/test/index.html b/test/index.html
index 9ea22f29..c055dc0a 100644
--- a/test/index.html
+++ b/test/index.html
@@ -1,27 +1,29 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch experiments</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch experiments</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
-    <a href="1.html">Link 1</a>
-    <a href="2.html">Link 2</a>
-    <a href="3.html">Link 3</a>
-    <section id="stuff">
-        <a href="main.css">CSS</a>
-    </section>
-    <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
-    <script src="../dist/quicklink.umd.js"></script>
-    <script>
-        quicklink();
+  <a href="1.html">Link 1</a>
+  <a href="2.html">Link 2</a>
+  <a href="3.html">Link 3</a>
+  <section id="stuff">
+    <a href="main.css">CSS</a>
+  </section>
+  <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
+  <script src="../dist/quicklink.umd.js"></script>
+  <script>
+    quicklink();
         // quicklink({ priority: 'high' });
-    </script>
-    <script type="module">
+  </script>
+  <script type="module">
     // import quicklink from "../dist/quicklink.mjs";
     // quicklink();
     // quicklink({
@@ -31,6 +33,7 @@
     // quicklink({
     //     el: elem
     // });
-    </script>
+  </script>
 </body>
+
 </html>
\ No newline at end of file
diff --git a/test/test-allow-origin-all.html b/test/test-allow-origin-all.html
index 4a34825a..dfc87971 100644
--- a/test/test-allow-origin-all.html
+++ b/test/test-allow-origin-all.html
@@ -1,13 +1,15 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
+    <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <title>Prefetch: Allow All Origins</title>
     <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+    <link rel="stylesheet" media="screen" href="main.css">
+    <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
     <a href="https://example.com/1.html">Link 1</a>
     <a href="2.html">Link 2</a>
@@ -24,4 +26,5 @@
         });
     </script>
 </body>
-</html>
+
+</html>
\ No newline at end of file
diff --git a/test/test-allow-origin.html b/test/test-allow-origin.html
index ca9ed817..c1057c78 100644
--- a/test/test-allow-origin.html
+++ b/test/test-allow-origin.html
@@ -1,26 +1,29 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch: Allowed Origins</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch: Allowed Origins</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
-    <a href="https://example.com/1.html">Link 1</a>
-    <a href="2.html">Link 2</a>
-    <a href="/~https://github.githubassets.com/images/spinners/octocat-spinner-32.gif">Spinner</a>
-    <section id="stuff">
-        <a href="main.css">CSS</a>
-    </section>
-    <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
-    <script src="../dist/quicklink.umd.js"></script>
-    <script>
-        quicklink({
-            origins: ['github.githubassets.com', 'example.com']
-        });
-    </script>
+  <a href="https://example.com/1.html">Link 1</a>
+  <a href="2.html">Link 2</a>
+  <a href="/~https://github.githubassets.com/images/spinners/octocat-spinner-32.gif">Spinner</a>
+  <section id="stuff">
+    <a href="main.css">CSS</a>
+  </section>
+  <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
+  <script src="../dist/quicklink.umd.js"></script>
+  <script>
+    quicklink({
+      origins: ['github.githubassets.com', 'example.com']
+    });
+  </script>
 </body>
-</html>
+
+</html>
\ No newline at end of file
diff --git a/test/test-basic-usage.html b/test/test-basic-usage.html
index b1bf7ba5..37461f55 100644
--- a/test/test-basic-usage.html
+++ b/test/test-basic-usage.html
@@ -1,24 +1,27 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch: Basic Usage</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch: Basic Usage</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
-    <a href="1.html">Link 1</a>
-    <a href="2.html">Link 2</a>
-    <a href="3.html">Link 3</a>
-    <section id="stuff">
-        <a href="main.css">CSS</a>
-    </section>
-    <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
-    <script src="../dist/quicklink.umd.js"></script>
-    <script>
-        quicklink();
-    </script>
+  <a href="1.html">Link 1</a>
+  <a href="2.html">Link 2</a>
+  <a href="3.html">Link 3</a>
+  <section id="stuff">
+    <a href="main.css">CSS</a>
+  </section>
+  <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
+  <script src="../dist/quicklink.umd.js"></script>
+  <script>
+    quicklink();
+  </script>
 </body>
+
 </html>
\ No newline at end of file
diff --git a/test/test-custom-dom-source.html b/test/test-custom-dom-source.html
index 70f6ddac..e3a5c198 100644
--- a/test/test-custom-dom-source.html
+++ b/test/test-custom-dom-source.html
@@ -1,27 +1,30 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch: Custom DOM source</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch: Custom DOM source</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
-    <a href="1.html">Link 1</a>
-    <a href="2.html">Link 2</a>
-    <a href="3.html">Link 3</a>
-    <section id="stuff">
-        <a href="main.css">CSS</a>
-    </section>
-    <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
-    <script src="../dist/quicklink.umd.js"></script>
-    <script>
+  <a href="1.html">Link 1</a>
+  <a href="2.html">Link 2</a>
+  <a href="3.html">Link 3</a>
+  <section id="stuff">
+    <a href="main.css">CSS</a>
+  </section>
+  <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
+  <script src="../dist/quicklink.umd.js"></script>
+  <script>
     let elem = document.getElementById('stuff');
     quicklink({
-        el: elem
+      el: elem
     });
-    </script>
+  </script>
 </body>
+
 </html>
\ No newline at end of file
diff --git a/test/test-es-modules.html b/test/test-es-modules.html
index c75dc222..b39b531c 100644
--- a/test/test-es-modules.html
+++ b/test/test-es-modules.html
@@ -1,24 +1,27 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch: ES Modules</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch: ES Modules</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
-    <a href="1.html">Link 1</a>
-    <a href="2.html">Link 2</a>
-    <a href="3.html">Link 3</a>
-    <section id="stuff">
-        <a href="main.css">CSS</a>
-    </section>
-    <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
-    <script type="module">
+  <a href="1.html">Link 1</a>
+  <a href="2.html">Link 2</a>
+  <a href="3.html">Link 3</a>
+  <section id="stuff">
+    <a href="main.css">CSS</a>
+  </section>
+  <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
+  <script type="module">
     import quicklink from "../dist/quicklink.mjs";
     quicklink();
-    </script>
+  </script>
 </body>
+
 </html>
\ No newline at end of file
diff --git a/test/test-ignore-basic.html b/test/test-ignore-basic.html
index cdc1ad74..67612a16 100644
--- a/test/test-ignore-basic.html
+++ b/test/test-ignore-basic.html
@@ -1,27 +1,30 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch: Ignore Basic</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch: Ignore Basic</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
-    <a href="https://example.com/1.html">Link 1</a>
-    <a href="2.html">Link 2</a>
-    <a href="https://foobar.com/3.html">Link 3</a>
-    <a href="/~https://github.githubassets.com/images/spinners/octocat-spinner-32.gif">Spinner</a>
-    <section id="stuff">
-        <a href="main.css">CSS</a>
-    </section>
-    <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
-    <script src="../dist/quicklink.umd.js"></script>
-    <script>
-        quicklink({
-            ignores: /2.html/
-        });
-    </script>
+  <a href="https://example.com/1.html">Link 1</a>
+  <a href="2.html">Link 2</a>
+  <a href="https://foobar.com/3.html">Link 3</a>
+  <a href="/~https://github.githubassets.com/images/spinners/octocat-spinner-32.gif">Spinner</a>
+  <section id="stuff">
+    <a href="main.css">CSS</a>
+  </section>
+  <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
+  <script src="../dist/quicklink.umd.js"></script>
+  <script>
+    quicklink({
+      ignores: /2.html/
+    });
+  </script>
 </body>
-</html>
+
+</html>
\ No newline at end of file
diff --git a/test/test-ignore-multiple.html b/test/test-ignore-multiple.html
index d87dd49c..2978fd11 100644
--- a/test/test-ignore-multiple.html
+++ b/test/test-ignore-multiple.html
@@ -1,32 +1,35 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch: Ignore Multiple</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch: Ignore Multiple</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
-    <a href="https://example.com/1.html">Link 1</a>
-    <a href="2.html">Link 2</a>
-    <a href="https://foobar.com/3.html">Link 3</a>
-    <a href="/~https://github.githubassets.com/images/spinners/octocat-spinner-32.gif">Spinner</a>
-    <section id="stuff">
-        <a href="main.css">CSS</a>
-    </section>
-    <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
-    <script src="../dist/quicklink.umd.js"></script>
-    <script>
-        quicklink({
-            origins: true, // allow all initially
-            ignores: [
-                /example/,
-                (uri) => uri.includes('foobar'),
-                (uri, elem) => elem.textContent.includes('Spinner')
-            ]
-        });
-    </script>
+  <a href="https://example.com/1.html">Link 1</a>
+  <a href="2.html">Link 2</a>
+  <a href="https://foobar.com/3.html">Link 3</a>
+  <a href="/~https://github.githubassets.com/images/spinners/octocat-spinner-32.gif">Spinner</a>
+  <section id="stuff">
+    <a href="main.css">CSS</a>
+  </section>
+  <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
+  <script src="../dist/quicklink.umd.js"></script>
+  <script>
+    quicklink({
+      origins: true, // allow all initially
+      ignores: [
+        /example/,
+        (uri) => uri.includes('foobar'),
+        (uri, elem) => elem.textContent.includes('Spinner')
+      ]
+    });
+  </script>
 </body>
-</html>
+
+</html>
\ No newline at end of file
diff --git a/test/test-same-origin.html b/test/test-same-origin.html
index 36ed984d..8d81e66f 100644
--- a/test/test-same-origin.html
+++ b/test/test-same-origin.html
@@ -1,24 +1,27 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch: Same Origin</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch: Same Origin</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
-    <a href="https://example.com/1.html">Link 1</a>
-    <a href="2.html">Link 2</a>
-    <a href="/~https://github.githubassets.com/images/spinners/octocat-spinner-32.gif">Spinner</a>
-    <section id="stuff">
-        <a href="main.css">CSS</a>
-    </section>
-    <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
-    <script src="../dist/quicklink.umd.js"></script>
-    <script>
-        quicklink();
-    </script>
+  <a href="https://example.com/1.html">Link 1</a>
+  <a href="2.html">Link 2</a>
+  <a href="/~https://github.githubassets.com/images/spinners/octocat-spinner-32.gif">Spinner</a>
+  <section id="stuff">
+    <a href="main.css">CSS</a>
+  </section>
+  <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
+  <script src="../dist/quicklink.umd.js"></script>
+  <script>
+    quicklink();
+  </script>
 </body>
-</html>
+
+</html>
\ No newline at end of file
diff --git a/test/test-static-url-list.html b/test/test-static-url-list.html
index 35b20ab9..f979c230 100644
--- a/test/test-static-url-list.html
+++ b/test/test-static-url-list.html
@@ -1,26 +1,29 @@
 <!DOCTYPE html>
 <html>
+
 <head>
-    <meta charset="utf-8" />
-    <meta http-equiv="X-UA-Compatible" content="IE=edge">
-    <title>Prefetch: Static URL list</title>
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
-    <script src="https://polyfill.io/v2/polyfill.min.js?features=IntersectionObserver"></script>
+  <meta charset="utf-8">
+  <meta http-equiv="X-UA-Compatible" content="IE=edge">
+  <title>Prefetch: Static URL list</title>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="stylesheet" media="screen" href="main.css">
+  <script src="https://polyfill.io/v3/polyfill.min.js?features=IntersectionObserver"></script>
 </head>
+
 <body>
-    <a href="1.html">Link 1</a>
-    <a href="2.html">Link 2</a>
-    <a href="3.html">Link 3</a>
-    <section id="stuff">
-        <a href="main.css">CSS</a>
-    </section>
-    <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
-    <script src="../dist/quicklink.umd.js"></script>
-    <script>
+  <a href="1.html">Link 1</a>
+  <a href="2.html">Link 2</a>
+  <a href="3.html">Link 3</a>
+  <section id="stuff">
+    <a href="main.css">CSS</a>
+  </section>
+  <a href="4.html" style="position:absolute;margin-top:900px;">Link 4</a>
+  <script src="../dist/quicklink.umd.js"></script>
+  <script>
     quicklink({
-        urls: ['2.html','4.html']
+      urls: ['2.html', '4.html']
     });
-    </script>
+  </script>
 </body>
+
 </html>
\ No newline at end of file
