If the code for HTML is JVON, it means that:
letter 8th (H) is letter 10th (J). Letter 20th (T) is letter 22th (V) and so on.
It means that the encoding is taking the letter 2 positions forward.
Hence C=E, O=Q, M=O, I=K, T=V.
The answer is EQOOKV.
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