A friend of mine reports that Mozilla Seamonkey responds well to the Firefox fix to disable punycode (found in the article I posted in the OP).

Also, the profusion of Google Safe Browsing and other safe browsing extensions make it impossible to predict what any individual's Chrome install is going to do with the testing URL. Best to test and then take measures to fix if you see it as "https://www.apple.com/" in whatever is your favorite browser.