What does 'accurate and equivalent' refer to in alt text?

The phrase 'accurate and equivalent' in the context of alternative text (alt text) pertains to the requirement that alt text should convey the same essential information and meaning as the visual element it describes. This means that the alt text must accurately reflect what is depicted in the image or graphic, providing all the necessary details so that a user who cannot see the image can still understand the context and significance of the content.

This principle ensures that individuals with visual impairments can gain the same insights as those who can see the visuals, thereby enhancing accessibility. For example, if an image displays a chart, the alt text should succinctly summarize what the chart represents, including any key data points or conclusions drawn from it.

The other options do not align with the meaning of 'accurate and equivalent' in terms of effective alt text. Using fancy language can detract from clarity, redundancy is not a requirement for alt text and might lead to confusion, and lengthy descriptions are often unnecessary or unwieldy, potentially overwhelming a user rather than providing straightforward information.