ensure all images have alt text

404.html

@@ -9,5 +9,5 @@ permalink: /404.html
   <h1>Move along. (404 error)</h1>
   <br/>
 
-  <img src="{{ 'assets/img/404-southpark.jpg' | relative_url }}" />
+  <img src="{{ 'assets/img/404-southpark.jpg' | relative_url }}" alt="Not found" />
 </div>

_includes/nav.html

@@ -37,7 +37,7 @@
     <div class="avatar-container">
       <div class="avatar-img-border">
         <a href="{{ '' | absolute_url }}">
-          <img alt="Navbar avatar" class="avatar-img" src="{{ site.avatar | relative_url }}" />
+          <img alt="Navigation bar avatar" class="avatar-img" src="{{ site.avatar | relative_url }}" />
         </a>
       </div>
     </div>

_layouts/home.html

@@ -41,7 +41,7 @@ layout: page
       {% if thumbnail != "" %}
       <div class="post-image">
         <a href="{{ post.url | absolute_url }}">
-          <img src="{{ thumbnail | absolute_url }}">
+          <img src="{{ thumbnail | absolute_url }}" alt="Post thumbnail">
         </a>
       </div>
       {% endif %}