{"version":"1.0","type":"rich","title":"update pattern","description":"Clicking Random generates a new alphabet subset, and the visualization demonstrates D3’s enter, update, and exit pattern. Letters slide vertically and horizontally via `d3.transition` while changing fill-opacity; entering letters appear green from above, exiting ones drop below in brown, and updates shift to new positions in dark gray. The code uses `d3.selectAll` with key functions for data joining, and renders animated SVG text elements.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/e916da83fa48404ea7bd2b6ded5984ce?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}