import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

testing/web-platform/tests/conformance-checkers/html-rdfa/0071-isvalid.html

@@ -0,0 +1,14 @@
+<!DOCTYPE html>
+<html prefix="cc: http://creativecommons.org/ns#">
+   <head>
+      <meta charset=utf-8>
+      <title>Test 0071</title>
+   </head>
+   <body>
+      <p>This page is under a Creative Commons
+         <a rel="cc:license"
+            href="http://creativecommons.org/licenses/by-nd/3.0/">
+          Attribution-No Derivatives 3.0 license</a>.
+      </p>
+   </body>
+</html>