1 files changed, 25 insertions, 9 deletions
diff --git a/parser/htmlparser/tests/mochitest/test_bug715739.html b/parser/htmlparser/tests/mochitest/test_bug715739.html
index 597160a19..e59fdf332 100644
--- a/parser/htmlparser/tests/mochitest/test_bug715739.html
+++ b/parser/htmlparser/tests/mochitest/test_bug715739.html
@@ -33,24 +33,30 @@ function textChildren(node) {
   return s;
 }
 
+var f, d;
+
 function tick() {
   runNumber++;
-  var f = document.getElementsByTagName("iframe")[0];
-  var d = f.contentDocument;
+  f = document.getElementsByTagName("iframe")[0];
+  d = f.contentDocument;
 
   if (runNumber == 1) {
-    d.open();
-    f.addEventListener("load", tick);
-    d.write("X");
-    d.write("\u003cscript>document.write('Y');\u003c/script>");
-    d.write("Z");
-    d.close();
+    frames[1].setTimeout(`
+      var d = parent.d;
+      var f = parent.f;
+      d.open();
+      f.addEventListener("load", parent.tick);
+      d.write("X");
+      d.write("\u003cscript>document.write('Y');\u003c/script>");
+      d.write("Z");
+      d.close();
+    `);
     return;
   }
   
   if (runNumber == 2) {
     var text = textChildren(d.body);
-    is(text, "XYZ", "Wrong text before reload.");
+    is(text, "ABC", "Wrong text before reload.");
     f.contentWindow.location.reload();
     return;
   }
@@ -63,10 +69,20 @@ function tick() {
   }
 }
 
+// We want to trigger a document.open/write with a different window as the
+// entry global.  Let's give that window a blob URL so we don't have to set up
+// extra helper files.
+var blob = new Blob(["ABC"], { type: "text/html" });
+var blobURL = URL.createObjectURL(blob);
+
 </script>
 </pre>
 <div id="content" style="display: none">
   <iframe></iframe>
+  <iframe></iframe>
 </div>
+<script>
+  document.querySelectorAll("iframe")[1].src = blobURL;
+</script>
 </body>
 </html>