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It's a bit dumb that the only way you can view it is on mouseover. Would be good if you could click the image, or there was an alt text icon to click.
This is not the answer you probably want to hear but if you really want to copy the text, right-click on the image and select 'inspect' or 'Inspect Accessibility Properties'. In both places you can find the alt text and copy it.
Pretty much this unless you use a non default UI that adds the alt text as a banner below.
Yeah elk.zone allows you to click on the alt text and it overlays it over the image. Should be copied in the default Mastodon UI.
Not a bad work-around, thank you.
Glad it works for you!
F12 but it is not really easy
Use view-source: before the page address of the photo or drawing. Then enable line breaks for convenience, then search for strings by key
property="og:image:alt"