{"version":"1.0","type":"rich","title":"Fork of HTML Starter","description":"This example creates an animated SVG grid of horizontal and vertical rectangles, revealing a circular aperture at the center through the use of D3.js masks. The code uses `d3.select`, `d3.range`, and `d3.join` to generate 100 rects in each direction, with two distinct mask groups to alternate light and dark circle patterns. A repeated `window.setInterval` triggers an alert dialog, interrupting the visual. The composition relies on SVG `<mask>` elements to blend the overlapping lines.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/d5fee372212e418ebb4ec78a96307d5d?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}