This example demonstrates how to scale flag images inside SVG elements using D3. A single circle is rendered and filled with a flag pattern sourced from the country-flags GitHub repository, using the Mexican flag’s PNG image. The code employs D3 selections to create a `<pattern>` element and an `<image>` inside a `<defs>` block, then applies the pattern as the circle’s fill. The `patternUnits` attribute is set to `objectBoundingBox`, allowing the flag to scale with the circle’s size.