- From: <bugzilla@jessica.w3.org>
- Date: Sun, 14 Nov 2010 14:37:06 +0000
- To: public-html-a11y@w3.org
http://www.w3.org/Bugs/Public/show_bug.cgi?id=10642 --- Comment #74 from Silvia Pfeiffer <silviapfeiffer1@gmail.com> 2010-11-14 14:37:03 UTC --- (In reply to comment #73) > (In reply to comment #72) > > Yes, but it is also impossible to render two different alternative texts for a > > single element unit. It's not like the <video> element and the poster are two > > separate elements - they are a single entity that is presented to sighted users > > as a single object on screen. How should two different alternative texts for a > > single object even be rendered? > > Hi Silvia, > > The User Agent Accessibility Guidelines may be helpful: > > QUOTE: > Guideline 3.1 Provide access to alternative content. > > 3.1.1 Identify Presence of Alternative Content The user has the ability to have > indicators rendered along with rendered elements that have alternative content > (e.g. visual icons rendered in proximity of content which has short text > alternatives, long descriptions, or captions). In cases where the alternative > content has different dimensions than the original content, the user has the > option to specify how the layout/reflow of the document should be handled. > (Level A). > > 3.1.2 Configurable Default Rendering: The user has a global option to specify > which types of alternative content by default and, in cases where the > alternative content has different dimensions than the original content, how the > layout/reflow of the document should be handled. (Level A) > > 3.1.3 Browse and Render: The user can browse the alternatives, switch between > them, and render them according to the following (Level A): > > 1. synchronized alternatives for time-based media (e.g., captions, audio > descriptions, sign language) can be rendered at the same time as their > associated audio tracks and visual tracks, and > 2. non-synchronized alternatives (e.g., short text alternatives, long > descriptions) can be rendered as replacements for the original rendered > content. > > 3.1.4 Rendering Alternative (Enhanced): Provide the user with the global option > to configure a cascade of types of alternatives to render by default, in case a > preferred type is unavailable. If the alternative content has a different > height or width, then the user agent will reflow the viewport. (Level AA) > UNQUOTE > > http://www.w3.org/TR/UAAG20/#principle-perceivable Hi Laura, We are talking about two non-synchronized short text alternatives to a single element that consists of a single image representation which is sourced potentially from two different Web resources, but maybe not. I can't see where such a situation is described in your quoted text nor can I think of a useful way to render the two text alternatives for the one video through a screen reader when tabbing onto the video. I don't think that situation has occurred in other elements before. Just to make sure: I totally believe we need to have multiple synchronized alternatives for different purposes. But that is not the issue under discussion. -- Configure bugmail: http://www.w3.org/Bugs/Public/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.
Received on Sunday, 14 November 2010 14:37:09 UTC