A stacked bar chart displays the percentage of student grades across six subjects, using categories from Fail to A. The visualization, rendered in SVG with D3 v7, highlights the distribution of grade counts per subject. The x-axis represents the count of students, while the y-axis lists the subjects. Hovering over each segment reveals a tooltip showing the precise percentage for that grade category within the subject. The chart uses a linear scale for counts, a band scale for subjects, and an ordinal color scale to differentiate grade levels.