This example shows a simple bar chart of categorical values labeled A through H, with the bar height encoding the amount for each category. It uses a tooltip to display the amount value when hovering over a bar, and the text labels fade out for the hovered bar to avoid overlap. The visualization is built with Vega, a declarative visualization grammar, and rendered using the Vega-Embed API. The code defines scales for the x and y axes, uses rectangular marks for the bars, and includes a text mark for labels. The data is embedded directly in the specification.