Typed characters appear in a running transcript alongside their ASCII decimal codes, while a corresponding symbol image fades in for each code. The animation proceeds character by character, with a two-second delay between steps. D3 v5 loads a CSV table that maps ASCII values to image links, and the code also uses `d3.select` to update the text area. User input comes from an HTML form and is processed via a JavaScript loop with `setTimeout` to sequence the transitions.