[webvtt] Change alt text for region diagram

silviapfeiffer has just created a new issue for https://github.com/w3c/webvtt:

== Change alt text for region diagram ==
Feedback from the Accessible Platform Architectures (APA) Working Group about the new WebVTT spec:

You have an alt= that is far too long, in APA's view. We would suggest
using Figure/Details (or even a longdesc) instead. The code involved is
the following:

   <div class="note" role="note">
    <p>The following diagram illustrates how anchoring of a region to a video viewport works. The black
 cross is the anchor, orange explains the anchor's offset within the region and green the anchor's
 offset within the viewport. Think of it as sticking a pin through a note onto a board:</p>
    <p><img alt="Within the video viewport, there is a WebVTT region.
 Inside the region, there is an anchor point marked with a black cross. The vertical and horizontal
 distance from the video viewport's edges to the anchor is marked with green arrows, representing
 the region viewport anchor X and Y offsets. The vertical and horizontal distance from the region's
 edges to the anchor is marked with orange arrows, representing the region anchor X and Y offsets.
 The size of the region is represented by the region width for the horizontal axis, and region lines
 for the vertical axis." src="webvtt-region-diagram.png"></p>
   </div>

The problem, of course, with long alt= is that the user who relies on
alt= is forced to digest the complete text each and every time they
source the page. With longish alt= that becomes quite annoying.

That's why we have Figure/Details (and longdesc), as you may well
recall. We want the textual description. We just don't want to enforce
it without the user asking to see the details.

Please view or discuss this issue at https://github.com/w3c/webvtt/issues/386 using your GitHub account

Received on Thursday, 28 September 2017 15:49:27 UTC