So, that leaves "the behaviour is unspecified" to describe the situation that you otherwise describe as "a shortcut for saying that the specification for the behavior is undefined.". Seems good to me.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
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In reply to Re^3: The behavior is [sic] undefined by BrowserUk
in thread The behavior is [sic] undefined by John M. Dlugosz

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