Given some samples of web navigation tasks and the web accessibility tree of dataset A and dataset B, list how B is {feedback} A. Return {num} points that summarize the characteristics of the two datasets. The two accessibility trees generated from the same website are provided. Please only list out characteristics that are related to the proposed web navigation tasks, the accessibility trees are provided to only help you understand the context of the proposed tasks, therefore do not mention the accessibility tree in your response. Please focus on granular and specific characteristics, and your generated characteristic points should apply to all the samples. Output should be a JSON list of strings. 

Accessibility Tree for dataset A:
{A_tree}

Sampled web navigation tasks from dataset A:
{A}

Accessibility Tree for dataset B:
{B_tree}

Sampled web navigation tasks from dataset B:
{B}