What technique is suggested for providing alternative text to visual representations in a canvas?

Adding aria-labelledby with external text is a recommended technique for providing alternative text for visual representations in a canvas. This approach allows for a more accessible interpretation of the content displayed within the canvas element without directly embedding the text within the graphic.

When using a canvas, which is typically rendered via scripting, traditional methods of providing alternative text—such as using the alt attribute—are not applicable. By utilizing the aria-labelledby attribute, you can link the canvas to a separate descriptive text, ensuring screen readers can relay this information to users who cannot see the visual. This method enhances understanding and ensures that the key information contained in the visual representation is conveyed effectively, promoting a better user experience for individuals with visual impairments.

Other suggested options either do not effectively ensure accessibility or fail to provide meaningful descriptions. For instance, using a complex description might overwhelm users instead of aiding comprehension, while inline images may not be suitable for all canvas elements. Providing an empty canvas doesn't offer any information to users needing accessibility support, making it insufficient for fulfilling accessibility standards.