Use absolute path

It is semantically correct than relative path.

railties/lib/rails/templates/rails/welcome/index.html.erb

@@ -59,7 +59,7 @@
 
 
       #header {
-        background-image: url("assets/rails.png");
+        background-image: url("/assets/rails.png");
         background-repeat: no-repeat;
         background-position: top left;
         height: 64px;
@@ -178,7 +178,7 @@
 
         if (info.innerHTML === '') {
           xhr = new XMLHttpRequest();
-          xhr.open("GET", "rails/info/properties", false);
+          xhr.open("GET", "/rails/info/properties", false);
           xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
           xhr.send("");
           info.innerHTML = xhr.responseText;
@@ -211,7 +211,7 @@
         </div>
 
         <div id="about">
-          <h3><a href="rails/info/properties" onclick="about(); return false">About your application&rsquo;s environment</a></h3>
+          <h3><a href="/rails/info/properties" onclick="about(); return false">About your application&rsquo;s environment</a></h3>
           <div id="about-content" style="display: none"></div>
         </div>