diff --git a/doc/accessibility/skip-content.html b/doc/accessibility/skip-content.html
index c785f6c12..3c1b2b492 100644
--- a/doc/accessibility/skip-content.html
+++ b/doc/accessibility/skip-content.html
@@ -85,14 +85,16 @@
             <nav>
                 <h1 class="sr-only">Skip Links</h1>
                 <ul>
-                    <li><a href="#content">Skip to Content</a></li>
-                    <li><a href="#searchField">Skip to Search</a></li>
-                    <li><a href="#navigation">Skip to Navigation</a></li>
+                    <li><a tabindex="0" href="#content">Skip to Content</a></li>
+                    <li><a tabindex="0" href="#searchField">Skip to Search</a></li>
+                    <li><a tabindex="0" href="#navigation">Skip to Navigation</a></li>
                 </ul>
             </nav>
         </div>
         <div id="logo">
-            <img width="92" height="32" title="" alt="" src="data:image/png;base64,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" />
+            <a href="skip-content.html">
+                <img width="92" height="32" title="" alt="" src="data:image/png;base64,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" />
+            </a>
         </div>
     </div>
     <div class="container clearfix">
@@ -122,7 +124,7 @@
         <div class="skip-links skip-links-inline">
             <nav>
                 <ul>
-                    <li><a href="#content2">Skip content</a></li>
+                    <li><a tabindex="0" href="#content2">Skip content</a></li>
                 </ul>
             </nav>
         </div>