diff --git a/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/resources/message-opener.html b/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/resources/message-opener.html
index 12836f536f0576..07662c63cd0133 100644
--- a/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/resources/message-opener.html
+++ b/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/resources/message-opener.html
@@ -1,12 +1,12 @@
 <script src="/common/PrefixedPostMessage.js"></script>
 <script>
 var prefixedMessage = new PrefixedMessageResource();
-var max = 50, attempts = 0;
+var max = 150, attempts = 0;
 function sendCoordinates() {
   // Certain windowing systems position windows asynchronously.
   // As a result, the window may not be positioned yet when the
   // load event fires. To accommodate this, allow waiting up to
-  // 5 seconds for positioning to take place.
+  // 15 seconds for positioning to take place.
   if (!window.screenX && !window.screenY && ++attempts < max) {
     setTimeout(sendCoordinates, 100);
     return;