What is the trigger warning for Huckleberry Finn?

Could you please elaborate on the concept of a trigger warning, particularly in relation to the novel Huckleberry Finn? Are there specific themes or passages within the book that have been identified as potentially triggering for certain readers, and if so, what are they? Additionally, how does the inclusion of a trigger warning affect the overall reading experience, and what are the arguments for and against their use in literature?