[Orgmode] image alt text for HTML export

[Aidan Gauland]

Is it possible to set the alt attribute of an image for HTML export?
If I insert an inline image into an Org buffer like so...

[[./foo.png]]

...and export it to HTML, I get something like this...

<img src="foo.png" alt="foo.png" />

But I want the alt attribute to be "foo" (or something else), not the
filename.

I know this is an HTML-specific setting, but I still want the image be
exported to other formats, so inserting literal HTML (see below) isn't
really suitable.

#+HTML: <img src="foo.png" alt="foo" />

If there is no way to do this, should I file a feature request?

--Aidan

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