Click on the chart and use the left and right arrow keys to move between classes, and the up and down arrow keys to move between the levels of a column and its total. Every cell announces its column's share of all passengers alongside its own value — a class of six and one of six hundred would otherwise read identically, and that difference is the whole reason a marimekko varies its widths. Press B for braille, T for text descriptions, and S to toggle sonification.
anychart.mekko() and anychart.barmekko() are read
the same way; they differ in the paddings and the default scale, not in
what the tiles mean.