import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

layout/reftests/details-summary/dynamic-add-details.html

@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html class="reftest-wait">
+  <script>
+  function runTest() {
+    // Append open <details> into <body>
+    var summary = document.createElement("summary");
+    var summary_text = document.createTextNode("Summary");
+    summary.appendChild(summary_text);
+
+    var paragraph = document.createElement("p");
+    var details_text = document.createTextNode("This is the details.");
+    paragraph.appendChild(details_text);
+
+    var details = document.createElement("details");
+    details.appendChild(summary);
+    details.appendChild(paragraph);
+    details.open = true;
+
+    document.body.appendChild(details);
+    document.documentElement.removeAttribute("class");
+  }
+  </script>
+  <body onload="runTest();">
+  </body>
+</html>