iCloud.com users saw an iOS-style notification at the top of their browser when visiting the website on Tuesday, it has been reported.

The notification message featured placeholder text, which read: “Default Title for English. English – This is test message description.” Beside the text was an ‘x’, which allowed users to close the message.

Apple Insider reports that users could not select the message, and it did not link anywhere.

The accidental delivery of this message to iCloud.com visitors suggests that iOS-like notification banners are on their way to Apple’s cloud storage service. This feature could arrive alongside the new Notification Center for Mac, which is set to launch with OS X 10.8 Mountain Lion this summer.

At is second quarter earnings call in April, Apple announced that iCloud has over 125 million users.

On Tuesday, Apple extended the iCloud storage upgrade for MobileMe Users, giving an extra three months of free iCloud storage upgrades as they make the transition to the newer service.

Microsoft is pitching its competing SkyDrive online storage service to Office for Mac users, calling Apple’s iCloud offering “not enough” for collaboration, file sharing and anywhere-access to documents.