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PrototypeJS Javascript Framework MCQs

Is it required to use Element#on exclusively?

Yes, though you can downgrade the version and use Element#observe for better performance.

No. It is perfectly acceptable to continue using Element#observe, though it is less efficient.

No. It is recommended that you use Element#observe because it is more efficient.

No. Neither of them are recommended.

Answer

Correct Answer: No. It is perfectly acceptable to continue using Element#observe, though it is less efficient.

Explanation:

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