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Making properly accessible PDFs is possible, but it is a pain in the ass. Certainly more difficult than with plain HTML.

It’s entirely possible to write accessible PDFs. It’s just that no-one does.

It is indeed! And you're right, nobody does, including this example.

And even if they did, many of the readers/viewers people use wouldn't fully support it.

While it's possible to royally mess up accessibility in HTML, too, the chances of getting something usable are at least somewhat better.

My thoughts exactly, I feel like it would be easier to write accessible webpages (given the wealth of accessibility tools).

Even Word documents are more accessible than PDFs.

Heck, even PDFs produced by Word (or comparable FOSS editors) are so much better (except if you've done it incorrectly by "printing" it) than this particular one.