Flashes the pinned site taskbar button.
This method is only supported in Internet Explorer 11 on Windows 10.
This method has no parameters.
This method does not return a value.
There are no standards that apply here.
Use msSiteModeActivate to notify the user of important application events. This method flashes the taskbar button 20 times, then highlights the button continuously until the window comes to the foreground. If the window is already in the foreground, this method does nothing.