{"version":"1.0","type":"rich","title":"JS practice","description":"This example demonstrates how SVG masks can combine two complementary cutout patterns. It renders a full-screen SVG canvas where a grid of vertical and horizontal rectangles is layered, with each set masked by a distinct circular hole centered in the viewport. The code uses the raw SVG DOM API via `document.createElementNS` to build masks, rectangles, and the masking circles, setting attributes like `mask` and `fill` directly. No JavaScript libraries are used; the result is a visible intersection of the two mask shapes across the rectangle layers.","provider_name":"VizHub AI Studio","provider_url":"https://vizhub.com","html":"<iframe src=\"https://vizhub.com/viz/8b56eb4e79074773abe83df02c295686?mode=embed\" width=\"960\" height=\"500\" scrolling=\"no\" frameborder=\"0\"></iframe>","width":960,"height":500,"cache_age":3600}