SVG fundamentals
This example demonstrates the VizHub V3 runtime environment for interactive coding and data visualization. The code exports a `main` function that receives a container element and renders "Hello World!" as SVG-compatible HTML text. It uses the container's clientWidth and clientHeight properties to establish measurable dimensions, and supports continuous hot reloading through interactive widgets where holding the Alt key and dragging a number in the editor adjusts the displayed font size. An accompanying Mouse Follower example illustrates how to build dynamic visualizations responding to user input.