In my opinion its up to you whether you design your site with this in mind or not. However, on the basis that every visitor has taken the time to visit your site, they are all important, regardless of disabilities.
Personally I always design my websites to be viewable to this audience - without going too far. A text only version of your site may be slightly annoying, but to some people means the difference between finding and not finding the information they require.
There has to be a balance between design and accessibility - I mean, if you made it completely accessible to everyone, your page would be simply the default text on the default background of your browser. Of course, you couldn't use tables as they are inaccessible. And don't change the font size, as people won't be able to see it...
First rule of web design, according to me: Content. The design is always secondary to this, being relatively superficial. However, a site devoid of all presentational devices for the sake of a handful of viewers isn't right either.
conclusion: make a text only version of your website as well as one with a normal design. I suggest doing this with includes, or external CSS - or some other fancy method that I am not aware of.
The right balance of accessibility and design makes for contented viewers!
- Vacant.
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