Two liquid-fill gauges render in separate containers, displaying proportional bubble-like fills at different positions. The example initializes two ECharts instances via `echarts.init`, targeting `#main` and `#sub` divs. Each instance sets a `liquidFill` series with different data values (`[0.6, 0.3]` and `[0.8, 0.2]`) and custom centers. The page loads D3 v5 and ECharts from CDNs, with basic styling from an external stylesheet.