earlier replies
Replying to @heydonworks
Wait, did you just tweet a picture of text about accessibility?
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Uh oh, it's the irony police 😄 It has alternative text; it's a picture to indicate I'm writing something that's not just a tweet.
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What do you mean with alternative text? Is there actually a way to set an “alt” attribute for a picture on Twitter?
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Yes! You may need to turn it on in settings. Some third party clients don't support it.
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Wow, I didn’t know about that. How do I get Twitter’s own web app to show it?
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It's somewhere in settings. A checkbox.
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I found the one to activate the editing option, but no way to activate its display. Anyway, apologies for abusing you as Twitter support
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What client are you using?
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None, just twitter.com
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Well that supports it. Not sure where you're going wrong.
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Replying to @heydonworks
Probably I’m being thick, but I just see the picture, no text, when I click, hover, right-click

Jun 10, 2018 · 6:06 PM UTC

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Replying to @stilkov
You have to be posting the picture?
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My misunderstanding was that I expected it to be visible for non-screenreader users, too
Replying to @stilkov @heydonworks
The Alt text in a tweet is only "visible" to screen readers, if the images doesn't load, or you look at the code The option to write the text is visible under the image when you compose the tweet. HTH
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Replying to @stilkov @heydonworks
It looks / sounds like this using the twitter client on android with talkback (built in screen reader)