Recently, the Shmoo Group discovered that Firefox is vulnerable to precisely the exploit that i predicted in my 2002 paper—Ping

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By this logic we should stop using language!—Ian

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It seems feasible to me to choose (or design) a font that would make all of the 7-bit printable ASCII characters clearly distinguishable.—Ping

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Render non 7-bit printable ASCII characters in a different color. Or with a different color background.—Mike

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How do you render a zero-width non-breaking space in a different colour? :)

Actually, i think your suggestion is a pretty good idea. Some invisible characters would still need to be outlawed, but for the remaining ones, the use of colour could help.—Ping

They are not legal in punycode, so the point is moot. —Ben

Problem if relying on differently colored characters, not if using background color covering some minimum width for each non-P7ASCII character.—Mike