4 ms·

The only objection I can think of is that the poster can be intended to convey meaning. If this meaning is entirely lost without an alt text, then the lack of a

The only objection I can think of is that the poster can be intended to convey meaning. If this meaning is entirely lost without an alt text, then the lack of an alt text for the poster is an oversight.

olavk 16y ago
But then again the use of colors in an image conveys meaning. That does not mean that there should be alt texts for each color channel. The alternative content should be provided at a level that makes sense if you don't have access to the specific media. The HTML5 spec specifically addresses accessibility for video like this: To make video content accessible to the blind, deaf, and those with other physical or cognitive disabilities, authors are expected to provide alternative media streams and/or to embed accessibility aids (such as caption or subtitle tracks, audio description tracks, or sign-language overlays) into their media streams. (http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#attr-video-poster http://www.whatwg.org/specs/web-apps/current-work/multipage/...) This is much more sensible that providing an alt text for the first frame in the video.
- devmonk 16y ago
  The standard should support an accessible version of what is staticly and dynamically displayed in the browser to a non-disabled person. If a non-disabled person will always see that frame on load, that frame needs an accessible way of making sense of that frame.
  - olavk 16y ago
    That ignores the content/presentation distinction which is essential for providing real accessibility.
deleted 16y ago
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isleyaardvark 16y ago
On the one hand, according to the current spec it's supposed to be a representative frame of the video. On the other hand, it's likely to be used to convey additional information about the video by content producers. (Title of the video/performers/location - think about how many people have inserted a single frame in a YouTube video in order for it to appear as the poster) I think the question is whether or not other attributes on the video tag can convey that information, making it redundant, or will the poster likely be used to convey different information.

olavk 16y ago

But then again the use of colors in an image conveys meaning. That does not mean that there should be alt texts for each color channel. The alternative content should be provided at a level that makes sense if you don't have access to the specific media. The HTML5 spec specifically addresses accessibility for video like this: To make video content accessible to the blind, deaf, and those with other physical or cognitive disabilities, authors are expected to provide alternative media streams and/or to embed accessibility aids (such as caption or subtitle tracks, audio description tracks, or sign-language overlays) into their media streams. (http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#attr-video-poster http://www.whatwg.org/specs/web-apps/current-work/multipage/...) This is much more sensible that providing an alt text for the first frame in the video.

devmonk 16y ago
The standard should support an accessible version of what is staticly and dynamically displayed in the browser to a non-disabled person. If a non-disabled person will always see that frame on load, that frame needs an accessible way of making sense of that frame.
- olavk 16y ago
  That ignores the content/presentation distinction which is essential for providing real accessibility.

deleted 16y ago

[deleted]

isleyaardvark 16y ago

On the one hand, according to the current spec it's supposed to be a representative frame of the video. On the other hand, it's likely to be used to convey additional information about the video by content producers. (Title of the video/performers/location - think about how many people have inserted a single frame in a YouTube video in order for it to appear as the poster) I think the question is whether or not other attributes on the video tag can convey that information, making it redundant, or will the poster likely be used to convey different information.