diff --git a/test.html b/test.html
index d16f7b3..98fb0cb 100644
--- a/test.html
+++ b/test.html
@@ -245,12 +245,12 @@
             <header><h2>Images</h2></header>
             <div>
               <h3>No <code>&lt;figure&gt;</code> element</h3>
-              <p><img src="http://placekitten.com/480/480" alt="Image alt text"></p>
+              <p><img src="//placekitten.com/480/480" alt="Image alt text"></p>
               <h3>Wrapped in a <code>&lt;figure&gt;</code> element, no <code>&lt;figcaption&gt;</code></h3>
-              <figure><img src="http://placekitten.com/420/420" alt="Image alt text"></figure>
+              <figure><img src="//placekitten.com/420/420" alt="Image alt text"></figure>
               <h3>Wrapped in a <code>&lt;figure&gt;</code> element, with a <code>&lt;figcaption&gt;</code></h3>
               <figure>
-                <img src="http://placekitten.com/420/420" alt="Image alt text">
+                <img src="//placekitten.com/420/420" alt="Image alt text">
                 <figcaption>Here is a caption for this image.</figcaption>
               </figure>
             </div>