Re: ARIA: Why is role="marquee" necessary? We already have role="log"

Great explanation. The current description is just too vague then.  
I'll make an editorial note to clear up the description of marquee.

On Dec 8, 2008, at 12:16 AM, Aaron M Leventhal wrote:

> role="marquee" is not like log, because in a marquee changes tend to  
> be fast and constant. Typically you don't want to hear all the items  
> as they scroll by in a marquee, because of the constant chatter that  
> would entail. Therefore the default aria-live value for marquee is  
> "off". Similar for role="timer" -- that's off by default as well.
>
> The concept is that where we can think of a very typical live region  
> use case, ARIA provides a role. This is a higher level semantic and  
> is easier for authors to know they're doing the right thing. They  
> might not be sure whether a marquee/timer/log/status should be  
> polite or off, but they can probably figure out that something is  
> one of those objects.
>
> - Aaron
>
>
> From:	James Craig <jcraig@apple.com>
> To:	WAI XTech <wai-xtech@w3.org>
> Date:	12/08/2008 03:07 AM
> Subject:	ARIA: Why is role="marquee" necessary? We already have  
> role="log"
>
>
>
>
>
> Why is role="marquee" necessary? We already have role="log" in the
> spec. Currently, the draft vaguely mentions, "A major difference
> between a marquee and a log is how fast it gets updates from timed or
> real world events."
>
> Unless someone has a good reason to keep it, I propose we ditch
> "marquee" and just use "log" for all instances.
>
>
>
>