Sometimes the people we exclude are the ones we did not realize were there. Screen readers are an essential tool for blind and visually-impaired people to use software and browse the Internet. In open source projects and communities, Markdown is a lightweight markup language used to format text. It is also used in many other places. Often you need to embed an image into whatever you are writing (a picture, a diagram, or some useful visual aid to get your point across). One of the lesser-known and used features of Markdown are alt tags for images.

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