Re: Web Accessibility: Detecting Assistive Technology
- From: "E.J. Zufelt" <lists@xxxxxxxxx>
- To: programmingblind@xxxxxxxxxxxxx
- Date: Fri, 20 May 2011 08:17:32 -0400
Flash is a browser extension, so by installing Flash into the browser there is
an ability to use Javascript to create a Flash object that can be injected into
the DOM.
Even if you simply insert your flash object in the page source, and do not
create it using Javascript, I believe that there is an ability to provide
fallback content for browsers where the Flash object doesn't load.
So, Javascript can "detect" flash because it can access the objects registered
by the browser extension, but since screen-readers do not register themselves
with browsers there is no way to detect them.
HTH,
Everett Zufelt
http://zufelt.ca
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On 2011-05-20, at 7:49 AM, DaShiell, Jude T. CIV NAVAIR 1490, 1, 26 wrote:
> Hacker tools are needed for that kind of detection. If javascript can't
> do it a properly configured hacker tool can be used to detect that a
> screen reader is not being used in browsing. If a tool finds none of
> the directory paths that screen reader applications put on machines as
> well as screen reader executeables it's safe to say no screen reader was
> being used in the browsing. If javascript isn't allowed or capable of
> doing a directory search though, how is it websites detect flash isn't
> loaded though?
>
> -----Original Message-----
> From: programmingblind-bounce@xxxxxxxxxxxxx
> [mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of Homme, James
> Sent: Thursday, May 19, 2011 16:23
> To: programmingblind@xxxxxxxxxxxxx
> Subject: Web Accessibility: Detecting Assistive Technology
>
> Hi,
>
> Is there a way through JavaScript or other means to detect that there
> may be a screen reader or other assistive technology browsing a page?
>
>
>
> Thanks.
>
>
>
> Jim
>
>
>
> Jim Homme,
>
> Usability Services,
>
> Phone: 412-544-1810.
>
>
>
>
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