This example compares two DNA sequences by constructing a dynamic programming matrix that calculates the longest common subsequence score. It visualizes the alignment scoring process through a grid of numerical values, where each cell represents the optimal match score up to that position. The code builds a multi-dimensional array in plain JavaScript, iterating through both sequences to fill the matrix with scores based on match, insertion, or deletion logic. No external visualization libraries are used; the example focuses solely on the algorithmic computation within the HTML file.