This visualization demonstrates a stacking order issue with the Vega-Lite API. It displays suicide rates by age group across years as stacked bar marks, where the color legend is correctly sorted by a custom age order, but the bar layering does not match that same sorted sequence. Using D3’s CSV loader for data ingestion, the code applies a viridis color scheme and attempts to set both color and order encodings with the same sort specification, revealing a mismatch in how Vega-Lite interprets these properties.