This example demonstrates a simple interactive bar chart using D3.js v6. The page displays four vertical bars with heights corresponding to the numbers in the `numbers` array. Users can click on any bar to remove it from the chart, triggering a D3 data join via `selectAll`, `enter`, and `exit` to update the visualization. The bars are styled with CSS classes and positioned using D3's `style` method to set height and margin-top attributes.