This example demonstrates a bar chart with dynamic labels that update as data values are added or removed. Clicking the "Add" or "Remove" text elements triggers transitions that shift bars and their corresponding numeric labels using D3.js version 4.5.0 with SVG rendering. The chart uses `d3.scaleBand` for the x-axis and `d3.scaleLinear` for the y-axis, with data bound via a key function. Entering bars slide in from the right, exiting bars slide out to the left, and labels move in sync with each 500-millisecond transition.