<Object> elements must contain a text alternative i.e. a text paragraph, an image with alt attribute, or a link to an alternative HTML version of this object.
Engine scans the page for
<object> elements and checks whether they have inner text or contain an image with alt attribute
In case the user agent does not support the media or the user has instructed the user agent not to render such elements there will be a fallback content which will be presented to the user
<p>Describes the object</p>