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How can I easily tell (on a phone) if an image has alt text or not on Mastodon. Would be great if Mastodon visibly flagged images that don’t have alt text with a warning in the interface so we know not to boost posts that don’t have it.

#accessibility #a11y
In iOS Safari, you can tap long on an image and if there is an alt text, it will show in the pop-up. This doesn't work in web views used in any other app than the native Safari app, including Add to Home Screen apps. I have used this method to read the alt text on xkcd comics.