The alert() box is not part of the page or the HTML and is usually rendered by the browser program as a separate GUI window. You cannot capture it using the usual browser automation.

I haven't looked at PhantomJS for a long time, so I don't remember if you can capture whether alert() was called and maybe prevent/document that.

In reply to Re: WWW::Mechanize::PhantomJS alert not appearing in screen shot by Corion
in thread WWW::Mechanize::PhantomJS alert not appearing in screen shot by tel2

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