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Feedback for Nick re: site readability for vision-impaired
First, thanks so much for including a segment on testing to ensure that your site is accessible to a wide variety of users! This is super important, and I feel that very few courses pay any real attention to it.
I respectfully disagree with your assertion that the captions under the photo are "good enough," both for the impaired vision test and the color blindness test. I have perfect vision and struggled to read them!
It would take only one quick adjustment in your code to change the text color, upping the contrast between the text and the background. I believe that it's worth doing to ensure that more people can access the information on the site. (One could argue, it's likely these users have a screen reader for the captions anyway, but I'd rather not make that assumption.)
There are millions of people out there with color blindness and visual impairments, and I feel like making that quick adjustment to the font would definitely be worth the effort.