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This is what the notification looks like when using Internet explorer.
To edit the actual notification, select the upgrade-browser element in the navigator, and select display block. Once done editing, select display none.
To re-use the browser notification, you can copy and paste it into other sites.
You also must copy the custom code in the Page Settings. To use the notification on every page, simply cut the code out of the page settings and place into the Head Code section of Custom Code in your Project Settings.