Accessible names for object elements (object-accessible-name)
Object elements that render non-text content must have a non-empty accessible name, provided using the title, aria-label, aria-labelledby, or fallback text content.
Note: Adding an img inside an <object> does not contribute to the object's accessible name.
Object ignores nested image:
This <object> element embeds content and includes a nested img with alt text. However, the image’s alt text is not used to compute the object's accessible name. As a result, the object remains unnamed and fails WCAG 1.1.1.