One way to describe a chart is to provide both a text summary and a properly coded data table near the chart. Generally speaking an ALT tag cannot do justice to a complex chart. Don’t convert tables of data into images-use an actual data table instead.WCAG 2.0 Guideline 1.4.1-"Color is not used as the only visual means of conveying information, indicating an action, prompting a response, or distinguishing a visual element." Use the formatting tools to change line styles and colors. NOTE: The default settings of the Chart Wizard in Excel are not color accessible. Charts should be readable in black and white. Supplement color-coding of charts with texture, differences in line style, text in graphs or different shades of color to improve accessibility for colorblind users.WCAG 2.0 Guideline 1.1.1-"All non-text content that is presented to the user has a text alternative that serves the equivalent purpose…" In some cases, a numeric table replicating the chart data could provide additional accessibility. If the data in a chart, graph or map is crucial to the content of a Web page, then you must provide a text description of the image.See the examples on this page for details on how to make charts more accessible. But since they are images, these media provide serious accessibility issues to colorblind users and users of screen readers. Charts, graphs and maps use visuals to convey complex images to users.
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