This bar chart visualizes Japanese historical eras, plotting each era’s name on the vertical axis against its span of years on the horizontal axis using an SVG rendering. It uses D3 v5 APIs including `scaleLinear`, `scaleBand`, `axisLeft`, and `axisBottom`, with data hard-coded as an array of era objects. The chart includes a title, axis label, and gridlines, with bars colored steelblue via CSS.