The attitude of a text about a subject is called tone.
Un literature, tone is understoo as the writer’s attitude toward the audience and the subject. Tone refers to the choices of words through which the attitude of a text is conveyed. Through tone, a writer conveys its viewpoints regarding a subject. A theme is involved in every written piece. The tone can be formal, informal, serious, comic, sarcastic, sad, or cheerful, or it may be any other existing attitude.