This page contains some screen grabs of various browsers showing the results from one of my test pages. There is Explorer on Windows 98, Mozilla and Safari on Mac OS X.
As you can see, most browsers cope well with this Action. Safari uses WebKit to render the pages, so any Mac browser that uses this service will also render the page correctly.
I don’t have a Windows XP machine to grab from here, but when I get near one, I'll add it to this page.