This example demonstrates responsive axes that adapt to a container’s changing dimensions using a ResizeObserver. The visualization shows a gray plot area with labeled x and y axes, where tick counts automatically adjust based on the inner width and height. The code builds on D3 v7, using `scaleLinear` for coordinate mapping, `axisBottom` and `axisLeft` for axis rendering, and modular functions imported from separate files to organize scales, labels, and axis components. The `observeResize` module triggers re-rendering whenever the container size changes.