> Obviously my colour vision is worse than Alexander's--I didn't even 
> realise there were two colours!

I also just did by chance when I looked at the TFT from another angle,
making the contrasts stronger.

> And I know there are a lot of people worse than me, because mine is 
> officially only a red-green deficiency, not colour-blindness.

Most "colour blindesses" are red-green deficiencies (9:100 males), so is
mine. Blue-yellow is rare, total colour blindness is even rarer (1:100,000)

> it should be switchable on a per-user basis. Maybe using css would 
> work, so each user can have a local style sheet override the colours

I never used local stylesheets because, as I said, I am not always at
the same place and dislike the thought to be dependent on something
installed locally on my box. But maybe I can cover a few cases like
this. How would I apply a local stylesheet? Download the original,
modify it to my liking, store it and tell the browser to use it for
certain pages?

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