Final answer:
The poem "Do not go gentle into that good night" is both a villanelle in structure and content, as it adheres to the strict structure of a villanelle and explores the theme of resisting death.
Step-by-step explanation:
The statement that "Do not go gentle into that good night" is a villanelle in both structure and content can be supported. The poem follows the strict structure of a villanelle with its repeating lines and alternating rhyme scheme. Furthermore, the poem addresses the content of resisting death, which is a common theme in villanelles.