Ha ha, it is hard to be more specific than nothing - because that is exactly what is happening. The browser is alive, the button show that it is clicked but no message is generated as the browser does not do anything - is not attempting to load any new page as in...nothing.
From wikipedia...
noth·ing [nuhth-ing]
noun
1. no thing; not anything; naught: to say nothing.
2. no part, share, or trace (usually followed by of ): The house showed nothing of its former magnificence.
3.something that is nonexistent.
4.nonexistence; nothingness: The sound faded to nothing.
5.something or someone of no importance or significance: Money is nothing when you're without health.