Write Accessible Chart Summaries

The chart is a contract with attention. If the viewer has to infer the question, decode a legend, compare angled slices, and remember which color means forecast, the design is spending attention before it earns trust. W3C/WAI complex-image alternatives for charts gives you a stricter sequence: first define the decision the visual must support, then choose an encoding that makes the needed comparison visible, then remove or document anything that could change interpretation. Mechanism The mechanism is cognitive economy. People can detect differences in aligned position and length quickly, but they struggle to estimate area, angle, and unlabeled color scales…

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