Does the "title" attribute not work? I tried adding one to the <span> containing your post and it worked. I assume that's non-standard.
Edit: Remove extra "if"
That's incorrect. There's nothing inherently inaccessible about the title attribute.
Voiceover, for example, reads the content of title attributes.
There are a bunch of reasons why title is pretty useless (the main one being it does nothing on every touch screen interface, where the concept of hover doesn't exist). But accessibility is not one of them.
I think we might be splitting hairs here. There are accessibility concerns with the title attribute. MDN describes why the title attribute is problematic from an accessibility perspective [1] and provides a list of links with additional details. That MDN page also indicates that the title attribute is problematic for:
- People using touch-only devices
- People navigating with keyboards
- People navigating with assistive technology such as screen readers or magnifiers
- People experiencing fine motor control impairment
- People with cognitive concerns
That's a non-trivial amount of web users. So is it technically accessible? Yes. But if you want to deliver an accessible experience to everyone, and the title attribute is going to cause issues, I personally would define that as not being accessible.
[1] https://developer.mozilla.org/en-US/docs/Web/HTML/Global_att...
Edit: Formatting
The title attribute disappears once you move the mouse off the object vs clicking to keep it open or having a delay on it.
You also can't have html in a title attribute.