Which attribute is most important for web page images in terms of accessibility?

The alt text description is the most important attribute for web page images in terms of accessibility because it provides a textual alternative for users who cannot see the images, such as those using screen readers or with visual impairments. Alt text communicates the content and purpose of the image, ensuring that all users can understand the information conveyed by the image, regardless of their ability to perceive it visually.

This practice aligns with web accessibility guidelines and makes the content more inclusive. By effectively describing the image, you not only improve usability for individuals with disabilities but also enhance overall SEO, as search engines use this information to index images.

While the other attributes mentioned, such as image file size, format type, and resolution, play roles in performance and visual quality, they do not directly impact accessibility in the same way that alt text does.