Visual Encoding
Learn how charts turn numbers into positions, lengths, angles, and shades, and which of those a reader can judge accurately.
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Text Alternative for Charts
Learn what WCAG requires of a chart’s text alternative, why a short label is not enough, and how the two-part description is structured.
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Small Multiples
Learn how repeating one chart across groups makes differences visible, why shared scales are essential, and when a single panel is better.
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Reference Band
Learn how a shaded comparison range makes a value interpretable, and why labeling one “normal” turns a description into an implied target.
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Color Accessibility
Learn the contrast ratios WCAG actually requires for text and for chart lines, and why color must never be the only channel carrying meaning.