Issue 2148 - Rewrite the testpages test suite

pages/filters/xmlhttprequest.tmpl

-title = $xmlhttprequest - ABP Test Pages
+title = $xmlhttprequest
 template = testcase
 
 {% set testcase_moreinfo = [
   ("Filter Options", "https://adblockplus.org/filters#options"),
 ] %}
 
 <script>
-function pagelog(message) {
-  var log = document.getElementById("testcase-fo-xmlhttprequest");
-  log.innerText = log.innerText + message + "\n";
-  console.log(message);
-}
-
 function aborted(evt) {
   pagelog("XMLHTTPRequest was aborted.");
 }
 
 function failed(evt) {
   pagelog("XMLHTTPRequest failed.");
 }
 
 function makerequest() {
   var req = new XMLHttpRequest();
   req.addEventListener("error", failed);
   req.addEventListener("abort", aborted);
   req.open("GET", "https://testpages.adblockplus.org/testcasefiles/xmlhttprequest/text.txt", true);
   req.onload = function(e) {
     if (this.status == 200) {
       pagelog(this.responseText);
        }
     };
   req.send();
 }
 
 document.addEventListener('DOMContentLoaded', makerequest, false);
 </script>
 
 <section class="site-panel">
   <h2>$xmlhttprequest</h2>
   <p>Check that usage of the $xmlhttprequest filter option works as expected.</p>
+  <p>With the filter displayed below each test case added to ABP (or with the testcase subscription installed and active), the XMLHTTPRequest  in each test case panel should be blocked but the images should not.</p>
 </section>
 
 <section class="site-panel">
   <h2>Test case</h2>
   <p>The XMLHTTPRequest should be blocked. The Image should not be blocked.</p>
   <div class="testcase-container">
     <div class="testcase-row">
-      <h3>XMLHTTPRequest</h3><div id="testcase-fo-xmlhttprequest"></div>
+      <h3>XMLHTTPRequest</h3><div id="testcase-output"></div>
     </div>
     <div class="testcase-row">
       <h3>Image</h3><img class="testcase-image" src="/testcasefiles/xmlhttprequest/image.jpg"/>
     </div>
   </div>
   <h3>Filters</h3>
-  testpages.adblockplus.org/testcasefiles/xmlhttprequest/$xmlhttprequest
+  <pre>testpages.adblockplus.org/testcasefiles/xmlhttprequest/$xmlhttprequest</pre>
 </section>