Question about restitution of aria-describedby

Hi everyone,

I have a question about how aria-describedby is supposed to be rendered 
or not by screen readers.

I'm submitting this test file (see attachement) with 3 cases:

 1. text with aria-describedby is linked to non-hidden text
 2. text with aria-describedby is linked to text hidden with aria-hidden
 3. text with aria-descrivbedby is linked with text hidden with
    display:none.


In case 1, it is normal for the text to be rendered. It seems strange to 
me that this also works on cases 2 and 3, whereas it works fine with NVDA.

Do you have any documentation about this behavior? Is it "normal"? If 
so, I'm having trouble understanding the logic. If it's not normal, and 
there are screen reader developers among you, I'd love a little 
explanation of this choice (I'll go fishing for info elsewhere if need be).

Many thanks in advance for any insight and documentation :)

Best Regards,
Armony

-- 
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