886009 - Expose fallback content in object element to AT

Status: NEW

(Core :: Disability Access APIs, defect)

Description

[Takeshi Kurosawa :takenspc]

Bug 495912 exposes fallback content in canvas element to AT,
But fallback content in object element is not exposed yet.

We could expose object element's fallback in a similar way.

W3C WAI published this technique with notes.
H53: Using the body of the object element | Techniques for WCAG 2.0
http://www.w3.org/TR/WCAG20-TECHS/H53.html

And HTML5 mentions:

> For example, a user could ask for the element's fallback content to be shown because that content uses a format that the user finds more accessible.

http://www.w3.org/html/wg/drafts/html/CR/embedded-content-0.html#the-object-element