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Are the any semantics on Severity of ApexPages.Message?
The documentation on Apex.Pages.Message lists the five severity levels but it doesn't say a word about whether they do anything special in the processing.
Like what does "CONFIRM" do? Does it just put up a message is does it engage in some sort of confirmation dialog automatically?
I'm using a custom controller so the stuff on standard controllers doesn't apply.
I don't believe there's any additional functionality, its more a matter of how the message is presented.
For example, the info is displayed as blue text with "careful" style icon, while error is in red with a "stop" style icon.