This example demonstrates a gauge chart built with React Hooks and D3 v5, where users can resize a video element and a draggable container while buttons adjust, filter, or append data values. The gauge renders as an animated SVG arc using `d3.arc` and `d3.pie`, transitioning between states via `transition.attrTween` with `d3.interpolate`. A separate bar chart uses D3 scales and axes with a `ResizeObserver` custom hook to handle dynamic container dimensions. Data updates trigger React state changes, which re-render both visualizations.