I've never actually seen one of those. Although I do not believe NVDA indicates when a longdesc is actually available, does it?
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----- Original Message -----
From: "Joseph Lee" <firstname.lastname@example.org>
Date: Sun, 27 Sep 2020 01:02:10 -0700
Subject: Re: [nvda] nvda +D = long description
A long description (often shortened to "longdesc") is used by web authors to provide additional details about a web element (typically images) via a dedicated description. As such, it is employed in browse mode only.
From: email@example.com <firstname.lastname@example.org> On Behalf Of Aschalew Byness
Sent: Sunday, September 27, 2020 12:53 AM
To: nvda <email@example.com>
Subject: [nvda] nvda +D = long description
May you explain to me what long description
NVDA+d means? When I read the nvda user guide, i couldn't understand
what long description
NVDA+d means and its use.