Update specification URLs in XMLHttpRequest/. 
diff --git a/XMLHttpRequest/progress-events-response-data-gzip.htm b/XMLHttpRequest/progress-events-response-data-gzip.htm index db97a40..dc166a2 100644 --- a/XMLHttpRequest/progress-events-response-data-gzip.htm +++ b/XMLHttpRequest/progress-events-response-data-gzip.htm 
@@ -5,7 +5,7 @@  <meta name="timeout" content="long">  <script src="/resources/testharness.js"></script>  <script src="/resources/testharnessreport.js"></script> - <link rel="help" href="http://www.w3.org/TR/progress-events/#firing-events-using-the-progressevent-interface-for-http" data-tested-assertations="following::p[contains(text(),'content-encodings')]" /> + <link rel="help" href="https://xhr.spec.whatwg.org/#firing-events-using-the-progressevent-interface-for-http" data-tested-assertations="following::p[contains(text(),'content-encodings')]" />  <!-- TODO: find better spec reference when https://www.w3.org/Bugs/Public/show_bug.cgi?id=25587 is fixed -->  </head>  <body>