This bar chart displays population estimates for ten countries using data from the United Nations World Population Prospects 2017, with each bar’s width scaled linearly by population. The visualization customizes both axes: the left axis removes its domain line and tick marks, while the bottom axis uses d3.axisBottom with a custom tick formatter that converts numbers into abbreviated “B” (billion) notation and extends tick lines across the plot height. The chart also removes the x-axis domain line and labels the population axis with a text element, with all elements rendered as SVG via d3-selection and d3-scale functions.