Twitter has announced a change for its Android and iOS apps that will make photos more accessible to people who are visually impaired. People who add photos to their tweets will soon be able to add alternative text that describes the images they add for those who can't see them, and descriptions themselves can be 420 characters long.
Twitter will also be extending this functionality to both its REST API and Twitter Cards, which will allow both publishers and third-party Twitter clients to add this capability to their platforms and apps. Image descriptions are rolling out now, though it could be a little while before you see them for yourself.
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