And for those who've noted that the NSA are going to have all the cool data, after seeing this chart, I'm pretty sure they'll start tapping into Jawbone as well.
[1] https://github.com/mbostock/d3/wiki#browser--platform-suppor...
It does date from the present decade, however. It's not that old. I'm somewhat amused by the number of sites which fail to work properly (some at all) with it.
Imgur is entirely dead. Reddit I can read, but moderation and reply buttons don't work. I hit the beta rollout of a news site last night (apparently part of their A/B test) and found that among the features which failed to work was the "opt out of beta" button.
D3 should work in any browser that supports SVG, which is every desktop browser but IE8 [1]. If you're still using IE8, some sites not working is going to be the least of your problems soon - Microsoft isn't patching it anymore.
The browser isn't a Microsoft product.
I've also found that the very rudimentary browsers included in cheap feature phones tend not to work particularly well with any measure of "modern" websites (though others do support these fairly well). While I don't suppose these are a large financial market, they're likely a large user market, as those phones are both cheap and exceptionally thrifty with battery life (weeks, not hours).
Given that this is graphical content, that's less a concern. But as I noted above: simply providing a fallback JPEG alt would have worked.
And noting an issue isn't the same as complaining. Actually, if you'll note, I fixed the problem, after a fashion, by providing a link to alternate and accessible content.
But thanks for your depth of understanding, empathy, and sympathy.