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Q:

Which of the following is added to prefs.js,when open a dialog box each time an error occurs?

A) user_pref("javascript.classic.error_alerts", true); B) user_pref("javascript.classic.error_alerts ", false);
C) user_pref("javascript.console.open_on_error ", false); D) user_pref("javascript.console.open_on_error ", true);

Answer:   A) user_pref("javascript.classic.error_alerts", true);



Explanation:
Subject: Web Technology
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