Two liquid-filled bubble gauges are rendered side by side using ECharts and its liquidFill extension. Each gauge displays two overlaid liquid levels—the left bubble shows proportions of 0.6 and 0.3, while the right shows 0.8 and 0.2—using the `echarts.init` method and a series configuration with `"type": "liquidFill"`. The gauges are positioned absolutely within separate divs, with a CSS transform applied to one container. The page also loads D3 v5, though the visualization itself relies entirely on ECharts' built-in rendering rather than D3 manipulation.