Everyone< On the domain mapping, does it show the domain

Hi Everyone<
On the domain mapping, does it show the domain that is being mapped after the site loades.
In other words. does mysite.com that is mapped to mysite.myblog.com show as mysite.com in the url/address bar? Or does it show as mysite.myblog.com after it is redirected to the mapped location?

Thanks for the time.
Richard