good morning. I unfollowed some of my favourite accounts today 😟
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They wouldn't necessarily but honestly it's just because I don't know what I'd add.
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Short description getting across the essence of the picture. It's read as a description of the image.
If there's relevant text, include the text in a clear way. So for example, if it's a screenshot of the tweet, make that clear and include the username, text, and date.
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I think the main issue is Twitter's UI. I know I should do this and want to do this but it's hard to remember. I always do it for documentation and web content.
Outside Twitter, alt="" is how you mark purely decorative images or ones you fully described with a proper label.
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Every image should either have a descriptive alt text or be marked as alt="" if it's either decorative or has a properly attached label.
Worth noting that search engines understand alt text and that's the way they traditionally searched for images before fancier ML recognition.