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This example demonstrates the simplest possible D3 version 7 program: it uses `d3.select` to target the document's body element and writes the text "Hello D3 asdad 7" directly into it. The rendering approach is plain HTML text set via the `text` method, with no data source or chart involved. The page itself is styled with a 13em font size, making the greeting the sole visual component, a test that the D3 library is properly loaded and callable.