Choropleth is a more common spelling

Author: bjartur

css-color-5/Overview.bs

@@ -51,7 +51,7 @@ Introduction {#intro}
 			Here, a pair of colors are being used
 			to define a color scale
 			on the Chroma-Lightness plane (constant Hue).
-			Below, the color scale in use on a chloropleth map.
+			Below, the color scale in use on a choropleth map.
 		</figcaption>
 	</figure>